The average kinetic energy of their particles is the same. So the correct option is A.
At room temperature, iron atoms are in the unusual position of being loosely packed open; however, as iron is heated up past 912 degrees C, the iron atoms become more tightly packed before relaxing at 1,394 C and finally melting down at 1,538 C.
The higher the temperature, the more active centers of corrosion are on the metal surface, and the faster corrosion processes develop, so it’s important to protect metal products, equipment, and structures that operate at high temperatures.
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The given question is incomplete. The complete question is given below:
What is true for two pieces of iron at the same temperature?
A. The average kinetic energy of their particles is the same.
B. The total kinetic energy of their particles is equal.
C. Heat flows from the larger object to the smaller object.
D. Heat flows from the object with higher potential energy to the object with lower potential energy.
Calculate the energy (a) in ev and (b) in joules of the third energy level (n= 3) ofa hydrogen atom.
The energy (a) in EV and (b) in joules of the third energy level (n= 3) of the hydrogen atom.
-1.51 eV
-2.42 x 10^-19 J
In physics, energy is a quantitative property that is transferred to a body or physical system and can be perceived in the performance of work or in the form of heat and light. Energy is Conserved - The law of conservation of energy states that energy can be transformed into form, but cannot be created or destroyed.
The energy price cap, introduced in 2019 by market regulator Ofgem, sets the maximum amount (known as the “unit price”) that utilities can charge per kWh of gas and electricity. There is no right or wrong answer to choosing between a fixed power plan and a variable power plan. Which energy rate is best for your home depends on your assessment of future energy prices and your willingness to take risks. Compare energy suppliers to find the perfect match.
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The wide variety of species on Earth, whether they are plants, animals or microscopic organisms, are vital to keep the world's many ecosystems healthy, balanced, and thriving. Which of these environmental impacts is MOST likely to have a positive impact on biodiversity?
Answer:
Plants provide us with food, medicine, wood, fuel, and fiber. In addition, they provide shelter for a multitude of other living beings, produce the oxygen we breathe, maintain the soil, regulate humidity and contribute to climate stability.
1. What are the three components of light and what are their units?
2. What component determines which color we perceive?
3. How is light produced in an atom? What is the difference between absorption and
emission?
4. One of the energy equations you should be familiar with is c = Xf, which means "the
speed of light (c = 3 x 10 m/s) = wavelength (A) multiplied by frequency (f). If you have a
light wave with a wavelength of 620 nm (this is orange light :), what is its frequency?
The three components of light Nature combines the soft, scattered light from the sky with the vibrant, focused light from the sun. Units are Candela, Lumen, Lux.
What are three components of light, and their units?Three elements that make up light Nature combines the vivid, sun-focused light with the gentle, sky-scattered light. Ambient lighting, which gives a room with its fundamental brightness, and zone lighting, which concentrates on particular regions, are analogous in the sophisticated home environment.Two physical as well as what we will consider subjective units are used to quantify light. Light is a physical unit when it is measured in terms of energy units because it is also regarded as energy. When it is measured based on brightness, candles, lux, and other arbitrary units are used.To Learn More About Components of Light, Refer :
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This type of pure substance contains more than one type of element chemically bonded
A. Compounds
B. Heterogeneous mixture
C. Homogeneous mixture
D. Elements
Answer:
A. Compounds
Explanation:
Firstly, don't let the word "pure" confuse you; this is pretty much irrelevant to the question.
The key to answering this question lies in "substance" and "more than one type of element chemically bonded."
Something you ought to memorize is that a substance is either an element or compound. Therefore, you can eliminate choices B./C.
Next, use the part of the definition that says "more than one type of element chemically bonded" to conclude that it's a compound. Not only is this the definition of a compound, but the fact that is says more than one type of element should automatically tell you that it is different from just a regular element (Choice D.).
A student adds 5400.0mL of 0.15M NaOH to 201.2mL of 4.0M NaOH. What is the final [NaOH]?
Answer:
0.287 M
Explanation:
Multiply the concentration of each solution by the volume of each (in liters) to get the moles of NaOH in that solution.
0.15 M • 5.4000 L = 0.81 mol NaOH
4.0 M • 0.2012 L = 0.80 mol NaOH
Add the mol of NaOH together to get the total --> 0.81 + 0.80 = 1.61 mol NaOH
Divide by the total volume of solution (5400.0 mL + 201.2 mL = 5,601.2 mL = 5.6012 L)
1.61 mol / 5.6012 L = 0.287 M NaOH
How many grams of silver are in 187g of Ag2S
There are approximately 144.88 grams of silver in 187 grams of Ag2S.To determine the amount of silver (Ag) present in 187g of Ag2S, we need to consider the molar mass and stoichiometry of the compound.
The molar mass of Ag2S can be calculated as follows:
Ag: 1 atom x 107.87 g/mol = 107.87 g/mol
S: 1 atom x 32.07 g/mol = 32.07 g/mol
Total: 107.87 g/mol + 32.07 g/mol = 139.94 g/mol
The molar mass of Ag2S is 139.94 g/mol, indicating that 1 mole of Ag2S weighs 139.94 grams.
To determine the amount of Ag in 187g of Ag2S, we can set up a proportion:
(187 g Ag2S) / (139.94 g Ag2S) = (x g Ag) / (107.87 g Ag)
Solving this proportion, we find:
x g Ag = (187 g Ag2S) * (107.87 g Ag) / (139.94 g Ag2S) = 144.88 g Ag
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The air pressure at the top of Mount
Everest is about 199 mm Hg.
What is the pressure on Everest in
atmospheres?
[?] atm
The air pressure at the top of Mount Everest in atmospheres is equal to 0.2618 atm.
What is pressure?In Science, pressure can be defined as a measure of the force exerted per unit area of an object or physical body. This ultimately implies that, pressure is usually measured in Newton per meter square and calculated by using this formula:
P = F/A
Where:
P represents the pressure.F represents the force.A represents the area.Generally speaking, air pressure can be measured in other units such as the following:
PascalAtmosphereMillimeters of mercury (mm Hg).In order to convert the value of pressure in millimeters of mercury (mm Hg) to atmosphere, we would divide by 760 as follows:
Air pressure = 199/760
Air pressure = 0.2618 atm.
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Answer: 0.261842
Explanation:
__________________ states that all samples of a pure compound contain the same elements in the same proportion by mass.
The statement that all samples of a pure compound contain the same elements in the same proportion by mass is referred to as the Law of Definite Proportions.
In chemistry, the law of definite proportions, also known as Proust's Law, states that a given chemical compound usually contains definite and constant proportions (by mass) of its constituent components, regardless of the method or origin of the compound's production. In other words, any given compound always contains the same elements in the same proportion by mass, and this constant proportion is specific to the compound's molecular identity and not to its method of preparation.
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synthesis of calcium carbonate lab mcgraw hill answers
In order to do this, particles were created by combining equal amounts of calcium chloride (CaCl2) and sodium carbonate (Na2CO3), with the initial salt concentrations of CaCl2 and Na2CO3 ranging from 5 10-4 to 5 10-2 M.
What is calcium carbonate?Calcium carbonate is utilized as a dietary supplement when the calcium intake from food alone is insufficient. For healthy bones, muscles, a neurologic system, and a heart, the body needs calcium. Calcium carbonate is also used as an antacid to treat heartburn, acid reflux, and stomach pain. Calcium carbonate has the chemical formula CaCO3. It is a chemical that frequently occurs in rocks as that of the minerals calcite & aragonite and is used as the main component of pearl, gastropod shell, eggshells, and the skeletons of shellfish. Calcareous refers to things with a high concentration of calcium carbonate or things that resemble it.
What is the side effect of calcium carbonate and is calcium carbonate harmful for health?High levels of calcium in your blood might cause swelling, rapid weight gain, or symptoms like nausea, vomiting, constipation, increased thirst or urination, muscular weakness, bone pain, confusion, a lack of energy, or feeling exhausted.
Effects on Humans: Humans' eyes, noses, mucous membranes, and skin are all physically irritated by calcium carbonate dust. When calcium carbonate dust comes into contact with the eyes, it produces swelling, soreness, and redness of the eyelids, whereas when it comes into contact with the skin, it causes mild local irritation.
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define avagrados law
Which of the following statements about buffers is false? a) a buffer resists changes in pH upon addition of small amounts of strong acids and bases b) a buffer solution can react with either HjOor OH ions c) a buffer solution resists change in pH upon small dilutions d) a buffer always consists of a weak acid and a soluble ionic salt of the weak acid e) most body fluids contain natural buffer systems
The false statement about buffers is: d) a buffer always consists of a weak acid and a soluble ionic salt of the weak acid.
Buffers are solutions that can resist changes in pH when small amounts of acids or bases are added. They typically consist of a weak acid and its conjugate base (or a weak base and its conjugate acid). The weak acid and its conjugate base are present in equilibrium, allowing the buffer to accept or donate protons to maintain a relatively constant pH. Option d is false because a buffer can consist of a weak acid and its conjugate base, or a weak base and its conjugate acid. It is not necessary for a buffer to always include a soluble ionic salt.
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Writing Prompt:
A large clump of ice is placed into a saucepan and heated to at least 375°C. Write at least two (2) paragraphs to explain the changes that would take place by using the following terms: physical change, states of matter, compound, solid, liquid, vapor and temperature change.
When ice is heated to at least 375 degrees Celsius, it will vaporize.
What happens when ice is heated above 375⁰C?
Ice is the solid state of frozen water, which usually occur at 0 degrees Celsius.
When ice is heated above 0 degrees Celsius, it melts into liquid water and further heating of the liquid water will increase to total internal energy of the liquid water.
Liquid water boils at 100 degrees Celsius and when the liquid water is heated above this temperature, it changes its phase from liquid to gaseous phase.
The ice heated to at least 375 degrees Celsius will vaporize.
The change in the state of the Ice from 0 degrees Celsius to 375 degrees Celsius include the following;
Ice(solid phase) → liquid water (liquid phase) → vapor (gaseous phase).
Thus, when ice is heated to at least 375 degrees Celsius, it will vaporize.
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15. The gerbils are prey for sharp-eyed hawks. How might the frequency of the black
fur and brown fur alleles change in the population after a fire blackens the area?
Will the frequencies vary proportionally (at the same rate)? Explain your answer.
The frequency of black fur and brown fur alleles in the gerbil population may change after a fire blackens the area due to the effects of natural selection. The frequencies vary proportionally (at the same rate) would not likely change.
Black-furred gerbils would have better camouflage in the charred environment, making them less visible to hawks, their predators. As a result, black-furred gerbils would have a higher survival rate, leading to an increase in the frequency of the black fur allele in the population. Conversely, brown-furred gerbils would be more conspicuous against the blackened backdrop, making them more vulnerable to predation. Consequently, the frequency of the brown fur allele may decrease as the number of brown-furred gerbils declines.
The frequencies of the black and brown fur alleles would not likely change at the same rate. This is because natural selection tends to act more on specific traits that provide a significant advantage or disadvantage in a given environment. In this scenario, the advantage of black fur for camouflage would lead to a more rapid increase in the frequency of the black fur allele, while the decrease in the brown fur allele frequency may be slower due to ongoing predation. Thus, the frequencies would not vary proportionally. So therefore in natural selection, the frequency of black fur and brown fur alleles in the gerbil population may change after a fire blackens the area and the frequencies vary proportionally (at the same rate) would not likely change.
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please help me
Read the passage and examine the photos. Then, suggest two reasons that scientists think developing pollen grains made vascular plants the most successful plants that live on land.
Passage
These mosses are nonvascular plants that grow closely packed together in moist places. The sperm they produce for sexual reproduction must swim to a nearby plant that has an egg that the sperm may fertilize.
Seed plants, such as these conifers, are vascular plants that live in both moist and dry places. For sexual reproduction, conifers produce pollen grains that contain sperm that cannot swim. Conifers produce massive amounts of pollen grains that can be carried by wind.
Answer:
Vascular plants are successful due to better transportation for water, nutrients and reproduction.
Explanation:
I got it right at school and hope this helps you learn to STUDY.jk
According to scientists, the evolution of pollinators made vascular plants the most successful land plants for two major reasons:
Sperm can be more effectively and widely distributed for sexual reproduction, thanks to pollen grains.Vascular plants can reproduce without the need for a moist environment because they can make pollen grains.What are Pollen grains?Plants with seeds, including flowering plants and conifers, produce pollen grains as a component of their reproductive process. They are often carried by wind or pollinators, such as bees, to the female reproductive organs of the same or different plant species, where they can fertilize female gametes (egg cells) and begin the development of seeds.
They carry the male gametes (sperm cells) of the plant. Many plant species depend on pollen grains for successful reproduction, and these grains have evolved a variety of forms, sizes, and surface features that make them easier to disperse and be recognized by pollinators.
Therefore, according to scientists, the evolution of pollinators made vascular plants the most successful land plants for two major reasons:
Sperm can be more effectively and widely distributed for sexual reproduction, thanks to pollen grains.Vascular plants can reproduce without the need for a moist environment because they can make pollen grains.Learn more about Pollen grains, here:
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a chemical combination of matter in definite (fixed) proportions is called a(n):
A chemical combination of matter in definite (fixed) proportions is called a compound.
A compound is made up of two or more different elements that are chemically combined in a fixed ratio. The properties of a compound are different from the properties of the individual elements that make it up. For example, water (H2O) is a compound made up of two hydrogen atoms and one oxygen atom. Water has different properties than the individual elements hydrogen and oxygen. The fixed proportions of a compound are determined by the chemical bonds that hold the atoms together.
A chemical combination of matter in definite (fixed) proportions is called a compound. In a compound, elements combine in specific ratios to form a new substance with distinct properties. These fixed proportions are determined by the chemical bonds between atoms in the compound. The elements in a compound cannot be separated by physical means, but rather require chemical reactions to break the bonds. In summary, a compound is a chemical combination of matter that consists of two or more elements bonded together in a fixed ratio, displaying unique properties and characteristics distinct from its constituent elements.
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Explain why this statement is false: “Because there is no change in composition during a physical change, the appearance of the substance will not change”
Does Anyone Need Answer To Question
Use the periodic table to answer the following questions:
Atoms of which element contain 25 protons?
✘ A) magnesium (Mg)
✘ B) aluminum (Al)
✘ C) tin (Sn)
✔ ∅ D) manganese (Mn)
And
Which element has an atomic number of 16?
✘ A) oxygen (O)
✔ ∅ B) sulfur (S)
✘ C) germanium (Ge)
Answer:
atom with 25 protons is manganese because number of protons equal to atomic number of an atom
also element with atomic number 16 is sulfur atom
Early historical models of the solar system were geocentric. Which of these phrases describes a geocentric solar system?
A. the sun as a reference point
B. existing in a star system
C. Earth as a reference point
D. circular, orbital path of travel
The accurate description of a geocentric solar system is the earth as a reference point.
The solar system refers to the arrangement of the sun and the planets. The description of the solar system in which the earth constitutes the center or reference point is called the geocentric model.
An alternative and more accurate model devised by Copernicus is the heliocentric model in which the sun lies at the center of the solar system.
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if the mass number of an atom is 23 and the number of neutrons in the nucleus of an atom is 12, then the atomic number is:
12
23
11
35
At a fixed pressure, if the temperature is doubled, the volume of a gas will be
Answer:
Doubled.
Explanation:
The relationship between the temperature and the volume of a gas at a constant pressure can be described using Charles' law:
V₁*T₂ = V₂*T₁That means that the temperature and the volume of a gas are directly proportional: The higher the temperature, the higher the pressure. If one of those factors is increased twofold, the other one will be increased twofold as well.
What happens to the density of group 1 when you go down the group
the density increases down the group.
a 1200 ml sample of helium gas is at a pressure of 350 mmhg and a temperature of 300 k. what volume will this gas sample occupy if the pressure is increased to 700 mmhg and the temperature is increased to 400 k?
The initial volume of the helium gas sample is 1200 ml, the initial pressure is 350 mmHg, and the initial temperature is 300 K. We need to find the volume of the gas sample when the pressure is increased to 700 mmHg and the temperature is increased to 400 K.
We used the combined gas law equation, (P1 * V1) / (T1) = (P2 * V2) / (T2), to relate the initial and final conditions of the gas sample. By rearranging the equation and substituting the given values, we calculated the final volume to be approximately 1142.86 ml.
Additional Information: It is important to note that the final volume of the gas sample is slightly less than the initial volume of 1200 ml. This is because the pressure and temperature have increased, causing the gas particles to move more vigorously and occupy more space. Thus, the final volume is expected to be slightly more than 1200 ml. However, in this specific case, the increase in pressure counterbalances the increase in temperature, resulting in a final volume that is slightly less than the initial volume.
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Escribe verdad o falso: La clorofila capta la energía luminosa del sol. () La fotosíntesis degrada las sustancias orgánicas que nesecitas las células()
Answer:
La clorofila capta la energía luminosa del sol. (verdadero) La fotosíntesis degrada las sustancias orgánicas que nesecitas las células(falso)
Explanation:
La clorofila es la encargada de dar el pigmento de color verde en las plantas y la que transforma la energia luminica en energia quimica, es por eso que es verdadera.
La fotosintesis NO degrada las sustancias organicas, sino que transforma un sustrato inorganico en una fuente energetica organica para las plantas.
Esto se debe por que las plantas o vegetales son autonomas, es decir que se autoabastecen energeticamente sin necesidad de ingerir alimentos como en el caso de los mamiferos.
Which of the following could fom an ionic bond with an anion?
O Hg2+
O NO
O so,2-
O Ar
Answer:
the correct answer is A, Hg22+ on edge 2020
Explanation:
i took the review
\(\rm Hg^{2+}\) among the following could form an ionic bond with an anion. Therefore, the correct option is option A.
A specific kind of chemical bond known as an ionic bond is created when two atoms or ions with distinctly dissimilar electronegativities come together. When two atoms have a strong inclination to gain electrons and a strong tendency to lose electrons, it happens. One atom donates one or more electrons to the other as a consequence, which strongly attracts the oppositely charged ions through electrostatic forces.
Mercury is an ion, and the cation \(\rm Hg^{2+}\) has a 2+ charge. With an anion, it is able to establish an ionic bond. Nitric oxide (NO) is a neutral molecule, not an ion. With an anion, it is unable to create an ionic bond. Sulfite ion \(\rm SO^{2- }\)is an anion with a 2-charge. With another anion, it is unable to create an ionic bond. Ar is not an ion but a neutral argon atom. With an anion, it is unable to create an ionic bond.
Therefore, the correct option is option A.
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Detects radio waves from objects in space:
a) Radio Telescopes
b) Reflection Telescope
c) Compound telescope
d) Refraction telescope
Answer:
The correct answer is A
Explanation:
A radio telescope is used to detect, collect and focus radio waves from distant objects in the sky or space. While a compound telescope, by design, can both refract and reflect waves. A reflection telescope uses curved mirrors to reflect light to form an image. A refraction telescope forms an image using a lens as its objective.
From the above definitions, it can be deduced that option A is the correct answer.
Map aming Complete the table for a neutral atom of each element. Some labels may be used more than once, and some labels will not be used at all. Note: If you answer any part of this question incorrectly, a single red X ill appear indicating that one or more of the terms are placed incorrectly. sodium Element name: Symbol: Atomic number Mass number Number of protons: Number of electrons: Number of neutrons: argon copper Na Cu 18 40 23 18 12 chromium34 Hint
Neutral atoms are atoms of an element that have the same number of protons and electrons, resulting in an atom with a total charge of 0.
Each element has a distinct atomic number, which is equal to the number of protons in an atom of that element. The mass number of an element is equal to the number of protons and neutrons in the atom. The number of electrons in a neutral atom is equal to the number of protons.
For example, sodium has an atomic number of 11, meaning it has 11 protons. The mass number of sodium is 23, meaning it has 11 protons and 12 neutrons. Since sodium is a neutral atom, it also has 11 electrons. Similarly, argon has an atomic number of 18, meaning it has 18 protons.
Its mass number is 40, meaning it has 18 protons and 22 neutrons. Since argon is a neutral atom, it also has 18 electrons. Copper has an atomic number of 29, meaning it has 29 protons. Its mass number is 63, meaning it has 29 protons and 34 neutrons. Since copper is a neutral atom, it also has 29 electrons.
Lastly, chromium has an atomic number of 24, meaning it has 24 protons. Its mass number is 52, meaning it has 24 protons and 28 neutrons. Since chromium is a neutral atom, it also has 24 electrons.
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true or false. a less reactive halogen will displace a more reactive halogen from an aqueous solution of its salt.
Answer:
I think the answer is false
Rank the following bonds by increasing price volatility (duration). 1) \( 2,4,3,1 \) 2) \( 4,2,1,3 \) 3) \( 3,2,4,1 \) 4) \( 4,3,1,2 \) 5) \( 2,3,4,1 \)
The ranking of bonds by increasing price volatility (duration) is as follows:
2) 4,2,1,3
This means that option 2 ranks the bonds in the correct order of increasing price volatility.
The duration of a bond measures its sensitivity to changes in interest rates. Generally, bonds with longer durations are more sensitive to interest rate changes and exhibit greater price volatility.
In the given ranking, the bond with the lowest price volatility (shortest duration) is bond 4, followed by bond 2, bond 1, and bond 3. This implies that bond 4 is the least affected by interest rate changes and has the lowest price volatility, while bond 3 is the most sensitive to interest rate changes and has the highest price volatility.
The ranking is based on the understanding that longer-term bonds tend to have higher durations and are more susceptible to price fluctuations due to changes in interest rates, while shorter-term bonds have lower durations and exhibit lower price volatility.
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at the equivalence point for a weak acid-strong base titration, an equal number of h and oh- have reacted, producing a solution of water and salt. what affects the ph at the equivalence point for this kind of titration? group of answer choices the auto-ionization of water the basicity of the salt anion none of these the acidity of the salt cation
In a weak acid and strong base titration, the pH at the equivalence point is affected by: the basicity of the salt anion. Hence, the final pH of the equivalence factor will be higher than 7.
How do weak acid and strong base titration work?At the equivalence point, the mixture of a weak acid and a strong base produces basic salt. This happens because the acid is too weak to donate the hydrogen ions to the solution, so it has an anion of a strong base. Meanwhile, the base is strong enough to accept hydrogen ions from water, so it has a cation of a weak acid. It affects the salt pH to be greater than 7 (basic salt).
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Having done the experiment, explain briefly how the mass of zinc not equal the mass of lead gained (hint: the periodic table)
amount of Zn lost- .12 g
amount of Pb gained- 0.43 g
Answer:
Due to the difference in the relative atomic masses and therefore, the molecular masses of Zn and Pb, one mole of Zn is about 3.2 times lighter than one mole of Pb
Explanation:
From the periodic table, we have;
The atomic number of zinc, Zn = 30
The atomic mass of zinc, Zn = 65.38 amu
The molar mass of zinc, Zn = 65.38 g/mol
The atomic number of lead, Pb = 82
The atomic mass of lead, Pb = 207.2 amu
The molar mass of lead, Pb = 207.2 g/mol
Therefore, whereby equal number of moles of Zn is lost and Pb is gained, we have;
Mass of 1 mole of Zn = 65.38 grams
Therefore, 1 gram of Zn = 1/65.38 moles = 0.0153 moles
0.12 grams of Zn = 0.12×0.0153 = 0.00184 moles of Zn
Given that equal number of moles of Zn and Pb are involved in the reaction, the number of moles of Pb gained = 0.00184 moles
The mass of Pb gained = Number of moles of Pb gained × Molar mass of Pb
The mass of Pb gained = 0.00184 × 207.2 = 0.38 g ≈ 0.4 g.
Amount of Pb gained = 0.43 g ≈ 0.4 g