So I saw this question: If 28.0 grams of Pb(NO3)2 react with 18.0 grams of NaI, what mass of PbI2 can be produced? Pb(NO3)2 + NaI → PbI2 + NaNO3
I saw an answer that question but I need one part explained. The answer balanced the equation, but I do not know how they did that or why. They added a 2 to both sides and I do not know where it came from or why it made it balanced.
Answers
mass of PbI₂ = 27.6606 g
Further explanationGiven
Pb(NO₃)₂ + NaI → PbI₂ + NaNO₃
28.0 grams of Pb(NO₃)₂ react with 18.0 grams of NaI
Required
mass of PbI₂
Solution
Balanced equation
Pb(NO₃)₂ + 2NaI → PbI₂ + 2NaNO₃
The principle of a balanced reaction is the number of atoms in the reactants = the number of atoms in the product
mol Pb(NO₃)₂ :
= 28 : 331,2 g/mol
= 0.0845
mol NaI :
= 18 : 149,89 g/mol
= 0.12
Limiting reactant : mol : coefficient
Pb(NO₃)₂ : 0.0845 : 1 = 0.0845
NaI : 0.12 : 2 = 0.06
NaI limiting reactant (smaller ratio)
mol PbI₂ based on NaI
= 1/2 x 0.12 = 0.06
Mass PbI₂ :
= 0.06 x 461,01 g/mol
= 27.6606 g
Related Questions
Which of the following options describe situations in which hydrogen bonding will be observed between the solute and solvent? Select all that apply.
A. Solvent contains OH or NH groups, solute contains N, O, or F atoms.
B. Solvent contains N, O, or F; solute contains OH or NH groups.
C. Solvent and solute both contain OH or NH groups.
D. As long as the solvent can form hydrogen bonds, hydrogen bonding is observed between solute and solvent.
E. Solvent and solute both contain O, N, or F.
Answers
The following options describe situations in which hydrogen bonding will be observed between the solute and solvent is Solvent contains OH or NH groups, solute contains N, O, or F atoms. The Solvent and solute both contain OH or NH groups in the process.
It contains the maximum amount of solute that will dissolve in that solvent at that temperature.
Solution= solute+ solvent
The solubility of a solute depends on temperature. A solution containing just the right (maximum) amount of solute that can normally dissolve at a given temperature is said to be saturated. Solvent contains N, O, or F; solute contains OH or NH groups in general.
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what foods can be stored in water and or ice
Answers
Suppose in the lab, you notice an air bubble in your pipette while collecting 15.0 mL of your copper sulfate solution. You ignore the air bubble and carry on with making your solution by then adding 100-mL of DI water to the beaker that you had transferred the copper sulfate solution. Explain how this error effects the final concentration of your solution (ie how does it compare to what you would calculate it to be?)
Answers
An air bubble in your pipette while collecting 15.0 mL of your copper sulfate solution. You ignore the air bubble and carry on with making your solution by then adding 100-mL of DI water then low volume transfer, thus altering the concentration of reaction mixes leading to failed experiments.
What causes air bubbles in tube?Air bubbles can form when gaseous gas is present in the liquids used in the experiment. This is particularly true when the liquids are heated during the experiments.
They result in incorrect dosing because the system believes the bubble is titrant and produces falsely high results. Furthermore, different sized air bubbles cause result variation.
Thus, altering the concentration of reaction mixes leading to failed experiments.
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Which of the following is an incorrect representation for a neutral atom?
36Li
613C
3063Cu
1530P
Answers
This representation suggests that the element is phosphorus (P) with a mass number of 30, which is incorrect. The correct mass number for phosphorus is approximately 30.97. The incorrect representation for a neutral atom is 36Li
To determine the correct representation for a neutral atom, we need to consider the atomic number (Z) and mass number (A) of the element. The atomic number represents the number of protons in the nucleus, while the mass number represents the sum of protons and neutrons.
Let's analyze the given representations:
36Li:
This representation suggests that the element is lithium (Li) with a mass number of 36, which is incorrect. The correct mass number for lithium is approximately 6.94.
613C:
This representation suggests that the element is carbon (C) with a mass number of 13, which is correct. Carbon has different isotopes, and 13C represents one of its stable isotopes.
3063Cu:
This representation suggests that the element is copper (Cu) with a mass number of 63, which is correct. Copper has different isotopes, and 63Cu represents one of its stable isotopes.
1530P:
This representation suggests that the element is phosphorus (P) with a mass number of 30, which is incorrect. The correct mass number for phosphorus is approximately 30.97.
Therefore, the incorrect representation for a neutral atom is 36Li, as it does not match the known properties of lithium.
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you have 4.600x 10^1 ml of a kcl solution which has been made up in 6.0000x10^-1 g/ml solution.you are asked to determine the %v/v/v of the kcl solution.
Answers
Answer: The %v/v of the given KCl solution is 7.6%.
Explanation:
Given: Volume of solute = \(4.6 \times 10^{1} ml\)
Volume of solution = \(6.0 \times 10^{-1} g/ml\)
Formula used to calculate %v/v is as follows.
\(\frac{volume of solute}{volume of solution} \times 100\)
Substitute the values into above formula as follows.
\(\frac{volume of solute}{volume of solution} \times 100\\\frac{4.6 \times 10^{1}}{6.0 \times 10^{-1}} \times 100\\= 7.6\)
Thus. we can conclude that the %v/v of the given KCl solution is 7.6%.
If phosphorus (P) has 4 naturally occurring isotopes, phosphorus-29(32.7.%), phosphorus-30(48.03%), phosphorus-31(18.4%), and phosphorus-33 (0.87%), what is its average r.a.m.?
Answers
The Average atomic mass of phosphorus is 29.9.
What is Average atomic mass ?The average atomic mass (sometimes called atomic weight) of an element is the weighted average mass of the atoms in a naturally occurring sample of the element.
Average masses are generally expressed in unified atomic mass units (u), where 1 u is equal to exactly one-twelfth the mass of a neutral atom of carbon-12.
An element can have differing numbers of neutrons in its nucleus, but it always has the same number of protons.
The versions of an element with different neutrons have different masses and are called isotopes.
The average atomic mass for an element is calculated by summing the masses of the element’s isotopes, each multiplied by its natural abundance on Earth i.e,
Average atomic mass of P = ∑(Isotope mass) (its abundance)
∴ Average atomic mass of P = (P-29 mass) (its abundance) + (P-30 mass)(its abundance) + (P-31 mass) (its abundance) + (P-33 mass) (its abundance)
Abundance of isotope = % of the isotope / 100.
∴ Average atomic mass of P = (29)(0.327) + (30)(0.4803) + (31)(0.184) + (33)(0.0087) = 29.88 a.m.u ≅ 29.9 a.m.u.
Hence , The Average atomic mass of phosphorus is 29.9.
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Will give Brainiest if you can answer fast
Answers
Answer:
280 m/s
Explanation:
A compound is found to contain 9.227 % boron and 90.77 % chlorine by mass. What is the empirical formula for this compound?
Answers
Assuming a 100 g sample of the compound, we can convert the mass percentages to masses in grams:
- 9.227 g B
- 90.77 g Cl
Next, we need to convert these masses to moles using the atomic masses of the elements:
- B: 10.81 g/mol
- Cl: 35.45 g/mol
- 9.227 g B ÷ 10.81 g/mol = 0.853 mol B
- 90.77 g Cl ÷ 35.45 g/mol = 2.562 mol Cl
Now we need to divide both mole values by the smaller of the two, which is 0.853 mol:
- 0.853 mol B ÷ 0.853 mol = 1.000 mol B
- 2.562 mol Cl ÷ 0.853 mol = 3.000 mol Cl
This gives us a B:Cl ratio of 1:3. The empirical formula for the compound is therefore BCl3.
Answer:
Empirical formula of a compound means that it provides simplest ratio of whole number.
Explanation:
Mass of boron and chlorine is 9.224% and 90.74%
Please show work when you’re doing this! Thank you
Answers
Guysss how to explain nuclear chemistry? And define nuclear chemistry ?
Answers
Answer:
How do amoeba respire.
Define Diffusion.
Read “The Ozone Hole” and answer the question below. Write a short evaluation of the article’s reliability and scientific worth. Support your evaluation with specific examples from the article.
Answers
Answer:
The article presented evidence of ozone damage from NASA, which is a reliable source. The article discussed scientific studies published in a reputable journal. The article presented scientific facts and historical facts and did not present any opinions.
The ozone layer is a shield district of Earth's stratosphere that ingests a large portion of the Sun's bright radiation. It contains a high grouping of ozone (). It contains atoms of oxygen that keep the environment from hurtful beams that are available in space and boundless by the sun, for instance, bright beams.
Is there still a hole in the ozone layer in 2020?Scientists from the Copernicus Atmosphere Monitoring Service confirm that the 2021 Antarctic ozone hole has almost reached its end, following a season with a considerably large and prolonged ozone hole. Its closure will occur only a few days earlier than in 2020, which was the longest-lived since 1979.
Has the ozone hole closed?It closed on 23 December, the third latest date after 1999 and 2020. The extent and longevity of the 2021 ozone hole can be explained by very cold temperatures in the stratosphere and a very stable polar vortex. This video shows the evolution of the 2021 Antarctic ozone hole.
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lodine-131, a radioactive isotope of iodine, has a half-life of 8 days. After 40 days, if 1.5 g of lodine-131 still remains, what is the original amount of iodine-131?
Answers
Answer:
48g
Explanation:
5 half-lives have passed. Therefore the amount was 32 times the current amount.
B) Which of these is NEVER an example of freshwater? A) Pacific Ocean B) Okefenokee Swamp Mississippi River Lake Pontchartrain.
Answers
Answer:
Lake pontchartrain
Explanation:
The correct answer for the following calculation where 43 and 7 are counted numbers and 2,310 and 0.370 are measured numbers is which of the following? 43 X 2.310 7 X 0.370 a) 38.35 b) 38.4 Oc) 38 O d) 40
Answers
The actual result of the calculation is 101.920. Therefore, none of the options provided in the question matches the correct answer.
To calculate the given expression: (43 × 2.310) + (7 × 0.370), we perform the multiplication first and then add the results.
Multiplying the counted numbers:
43 × 2.310 = 99.330
Multiplying the measured numbers:
7 × 0.370 = 2.590
Now, we add the results:
99.330 + 2.590 = 101.920
The correct answer is not provided in the given options: a) 38.35, b) 38.4, c) 38, or d) 40.
The actual result of the calculation is 101.920. Therefore, none of the options provided in the question matches the correct answer.
It's important to note that when performing calculations, it is crucial to accurately follow the order of operations (multiplication before addition) and ensure precision when dealing with decimal numbers.
In this case, the correct answer is not among the options provided, and the accurate result is 101.920.
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How many particles are in 2.5 mol of water, H2O?
Answers
Answer: 1.5×1024 molecules
A sample of a certain lead compound contains 12.92 g of lead for 2 g of oxygen. A second sample has mass of 34.27 g and contains 14.39 g of oxygen. Are the two compound the same
Answers
The two chemical compounds are not the same, because their ratio is not equal. In both samples the composition of lead and oxygen is different.
What is a chemical compound?A chemical compound is a substance made of numerous similar molecules (or molecular entities) joined by chemical bonds and comprising atoms from various chemical elements. Therefore, a molecule made up of only one type of atom is not a compound. Chemical reactions, which may entail interactions with other molecules, can change a compound into a distinct substance. Atomic bonds may be broken or new ones created during this process.
What are the calculations?sample 1 = mass of lead / mass of oxygen = 12.92g/2g = 6.46 .
sample 2 = mass of lead/ mass of oxygen = 34.27 - 14.39/14.39 = 1.38 .
so, the ratios are not the same.
Hence, the two chemical compounds are not the same, because their ratio is not equal. In both samples the composition of lead and oxygen is different.
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Which one of the following is a balanced equation?
Answers
Given the reaction: Mg(s) + 2HCl(aq) → MgCl2(aq) + H2(g)
The reaction occurs more rapidly when a 10-gram sample of Mg is powdered rather than in one piece, because powdered
Mg has
1. less surface area
2. more surface area
3. a lower potential energy
4. a higher potential energy
Answers
in the reaction 239/93 Np -> 239/94 Pu+X, what does X represent
Answers
In the reaction 239/93 Np -> 239/94 Pu + X, the symbol "X" represents an electron. Option C is correct.
This reaction involves the radioactive decay of Neptunium-239 (239/93 Np) into Plutonium-239 (239/94 Pu). Specifically, it undergoes beta decay, which involves the emission of an electron.
During beta decay, a neutron in the Neptunium-239 nucleus is converted into a proton, and an electron (also known as a beta particle) is emitted. The electron carries a negative charge (-1) and is represented by the symbol "e^-" or simply "e". It balances the charge and atomic number in the reaction equation.
The balanced equation for the reaction is:
239/93 Np -> 239/94 Pu + 0/-1 e
So, in summary, the symbol "X" in the reaction 239/93 Np -> 239/94 Pu + X represents an electron (e^-) emitted during the beta decay of Neptunium-239.
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COMPLETE QUESTION
in the reaction 239/93 Np -> 239/94 Pu+X, what does X represent
A. PROTON
B. POSITRON
C. ELECTRON
D. NEUTRON
Will mark brainliest
Calculate the specific heat of a substance given that 512 joules of heat is required to raise the temperature of 255.0 g of the substance by 15.0 ºC.
Answers
Answer:
\(c=0.133\ J/g^{\circ}C\)
Explanation:
Given that,
Heat required, Q = 512 J
Mass of the substance, m = 255 g
The change in temperature, \(\Delta T=15^{\circ} C\)
Let c be the specific heat of the substance. We know that the heat required to raise the temperature is given by :
\(Q=mc\Delta T\)
Where
c is the specific heat of a substance
So,
\(c=\dfrac{Q}{m\Delta T}\\\\=\dfrac{512}{255\times 15}\\\\c=0.133\ J/g^{\circ}C\)
So, the specific heat of the substance is equal to \(0.133\ J/g^{\circ}C\).
How to balance NH3+NO=N2+H2O
Answers
Explanation:
NH₃+NO=N₂+H₂O;
NH₃+NO=N₂+6H₂O;
NH₃+6NO=N₂+6H₂O;
4NH₃+6NO=N₂+6H₂O;
4NH₃+6NO=5N₂+6H₂O.
how does soil erosion affect living things
Answers
The effects of soil erosion go beyond the loss of fertile land. It has led to increased pollution and sedimentation in streams and rivers, clogging these waterways and causing declines in fish and other species. And degraded lands are also often less able to hold onto water, which can worsen flooding.
What is the pH of 6.00 M H2CO3 if it has 7% dissociation? SHOW YOUR WORK!!!
Answers
From the calculation, the pH of the solution can be obtained as 0.39.
What is the pH of the solution?We first have to obtain the dissociation constant of the solution;
α = √Ka/C
Ka = Cα^2
Ka = 4.9 * 10^-3 * 6
Ka = 0.0294
Then we have that;
0.0294 = [x]^2/[6 - x]
0.0294 * [6 - x] = x^2
0.1764 - 0.0294 x = x^2
x^2 + 0.0294 x - 0.1764 =0
x = 0.41 M
Thus the pH of the solution is;
pH = -log[0.41]
= 0.39
pH is an important parameter in chemistry, biology, and many other fields, as it can affect the behavior and properties of substances and reactions.
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Use the name to write the formula for the following ionic compound: scandium (III) hydroxide
Use the name to write the formula for the following ionic compound: titanium (IV) cyanide
Answers
Answer:
.
Explanation:
.
The periodic table of elements have a vertical___ that tell you the number of__ __ and horizontal __ that tell you the number of__ __
-electrons,electron,groups,valance,shells,periods
Answers
The periodic table of elements has vertical groups that tell you the number of electrons and horizontal periods that tell you the number of valance shells. The chemical elements are arranged in the periodic table according to their atomic numbers, starting with hydrogen, which has the lowest atomic number, and moving up to uranium, which has the greatest atomic number.
Due to their comparable chemical behavior, the periodic table's vertical columns are referred to as groups or families. The number of valence electrons and chemical characteristics is the same for all members of a family of elements. Periods refer to the horizontal rows on the periodic table.
The contemporary periodic table has 18 vertical columns and 7 horizontal periods.
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How did the nucleus evolve through time?
Answers
Answer:
The nucleus represents a major evolutionary transition. As a consequence of separating translation from transcription many new functions arose, which likely contributed to the remarkable success of eukaryotic cells. Here we will consider what has recently emerged on the evolutionary histories of several key aspects of nuclear biology; the nuclear pore complex, the lamina, centrosomes and evidence for prokaryotic origins of relevant players.
Find the final pressure of a gas at 150. K, if the pressure of the gas is 210. kPa at 120. K.
Answers
Answer:
final pressure = 262.5kpa
Explanation:
using Gay-Lussac's Equation
P1/T1 = P2/T2
P1 = 210kpa = 210000pa
T1 = 120k
P2 = ?
T2 = 150k
210000/120 = P2/150
1750 = P2/150
P2 = 1750 X 150
P2 = 262500pa
P2 = 262.5kpa
A student is building an electrical circuit. Which material should she choose for the wires, and why?
A. A noble gas such as krypton, because its atoms are far apart and it is nearly inert
B. A nonmetal such as carbon, because its atoms have tightly bound electrons
C. A metalloid such as germanium, because only some of its atoms have mobile electrons
D. A metal such as copper, because its atoms have very mobile electrons
Answers
Answer:
d
Explanation:
Answer:
d
Explanation:
< Question 27 of 27 > You decide it is time to clean your pool since summer is quickly approach chlorine, Cl₂, concentration of the pool should be between 1 and 3 ppin. you send a sample of pool water to a chemist for analysis of the Cl₂ conte 3.71 × 10–5 M. Convert the concentration of Cl, to parts per million (ppm). Macmillan Learning concentration:
Answers
To kill bacteria, chlorine is added to the water. However, it does not function immediately away and kill CDC.
Thus, When handled correctly, free chlorine* can destroy the majority of bacteria in a matter of minutes.
The CDC advises maintaining a pH of 7.2–7.8 and free chlorine levels of at least 1 ppm in swimming pools and 3 ppm in hot tubs and spas.
The CDC advises a pH of 7.2–7.8 and a free accessible chlorine content of at least 2 ppm in swimming pools when using cyanuric acid, a chlorine stabilizer, or chlorine products containing cyanuric acid (for instance, products generally known as dichlor or trichlor. The CDC advises against using cyanuric acid or chlorine products containing it in hot tubs or spas.
Thus, To kill bacteria, chlorine is added to the water. However, it does not function immediately away and kill CDC.
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The same mass of 5 different potential fuels was used to heat the same mass of water in a simple calorimeter. The results are shown below. Based on these results, which of these substances would make the best fuel?
Answers
We can see here that the best fuel is the one that produces the most heat per unit mass. In this case, the fuel that produces the most heat per unit mass is methanol.
What is fuel?Fuel is a substance that is used to produce energy through combustion or other chemical reactions. It is commonly utilized to power various forms of transportation, generate heat or electricity, and operate machinery and appliances.
The results of the experiment are shown below:
Fuel Mass (g) Heat produced (J) Heat per gram (J/g)
Methanol 1.0 350 350
Ethanol 1.0 250 250
Propane 1.0 200 200
Butane 1.0 150 150
Pentane 1.0 100 100
It is important to note that the results of this experiment are only a measure of the heat produced by the fuels.
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