One kind of battery usedin watches contains mercury(II) oxide. As current flows, themercury oxide is reduced to mercury.
HgO(s) + H2O(λ) + 2 e- → Hg(l) +2 OH-(aq)
If 1.8 x 10-5 amperes flows continuously for 1461 days,what mass of Hg(λ) is produced?
Answers
One kind of battery used in watches contains mercury(II) oxide. As current flows, the mercury oxide is reduced to mercury.
HgO(s) + H₂O(λ) + 2 e- → Hg(l) +2 OH-(aq)
If 1.8 x 10-5 amperes flows continuously for 1461 days, then approximately 0.00236 grams of Hg would be produced
We need to use Faraday's law of electrolysis, which relates the amount of substance produced to the electric current and the molar mass of the substance , to calculate the mass of mercury (Hg) produced .
The equation you provided shows the reduction of mercury(II) oxide (HgO) to mercury (Hg). According to this equation, 2 moles of electrons (2 e-) are required to produce 1 mole of mercury (Hg). Therefore, the stoichiometric ratio is 2 moles of electrons per mole of Hg.
The mass of Hg produced, we need to follow these steps:
Calculate the total charge (Q) in coulombs.
Q = I * t
I = current in amperes (1.8 x 10^(-5) A)
t = time in seconds (1461 days = 1461 * 24 * 60 * 60 seconds)
Calculate the number of moles of electrons (n) involved in the reaction.
n = Q / F
F = Faraday's constant = 96,485 C/mol e-
Use the stoichiometry of the reaction to calculate the moles of Hg produced.
1 mole of Hg corresponds to 2 moles of electrons.
Therefore, moles of Hg = n / 2
Calculate the mass of Hg produced using the molar mass of mercury (Hg).
Now we need to look up the molar mass of Hg, which is approximately 200.59 g/mol.
Mass of Hg = moles of Hg * molar mass of Hg
Let's perform the calculations:
t = 1461 days * 24 hours/day * 60 minutes/hour * 60 seconds/minute
t = 126,230,400 seconds
Q = (1.8 x 10^(-5) A) * 126,230,400 seconds
Q ≈ 2.27 Coulombs
n = 2.27 C / 96,485 C/mol e-
n ≈ 0.0000235 moles of electrons
moles of Hg = 0.0000235 moles of electrons / 2
moles of Hg ≈ 0.0000118 moles
Mass of Hg = 0.0000118 moles * 200.59 g/mol
Mass of Hg ≈ 0.00236 grams
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Related Questions
in which one of the following pairs will the first system have a higher entropy than the second? assume p and t are the same for each pair, unless stated otherwise. group of answer choices 1 mole he(g); 1 mole kr(g) 1 mole xe(g) at 1 atmosphere; 1 mole xe(g) at 0.5 atmosphere 1 mole ch4(g); 1 mole c2h6(g) 1 mole o2(g); 2 mole o(g) 2 mole o(g); 1 mole o2(g) flag question: question 2
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20 one-dollar dollars were randomly distributed among 20 people, or 20 one-dollar bills were randomly divided among 10 entropy .
Which reaction has a higher entropy?Compared to solids or liquids, gases possess higher entropies because of their chaotic mobility.This implies that entropy will alter during a process in which the quantity of gas molecules present changes.
How can you tell if entropy is rising or falling?Entropy increases as a substance transitions from a solid to a liquid to a gas, and by observing the phases of a reactants and products, you can determine if an entropy change was positive or negative.Entropy rises whenever the number of gas moles rises.
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what is a mixture of elements and compounds
Answers
The substance in the image above would be classified as a mixture of elements (option E).
What is a compound and mixture?A compound is a substance formed by chemical bonding of two or more elements in definite proportions by weight.
On the other hand, a mixture is made when two or more substances are combined, but they are not combined chemically.
According to this question, an image is shown with two different substances or elements as distinguished by coloration (white and purple). These elements are combined but not chemically bonded, hence, is a mixture.
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What is the molarity of a solution made from dissolving 3.0 moles of Saline (NaCl) in 0.25 L of solution?
Answers
Answer:
D
Explanation:
all ya got to do is divide the moles from the solution... so 3.0 divided by 0.25. put it in a calculator
hope this helps
The molarity of a solution made from dissolving 3.0 moles of Saline (NaCl) in 0.25 L of solution is 12M.
What is Molarity?Molarity of a given solution is known as the total number of moles of solute per litre of the solution. A solution that is 1.00 molar (written 1.00 M) contains 1.00 mole of solute for every liter of solution.
Molarity = (No. of moles of solute ÷ Volume of solution in liters)
The unit of molarity is mol L⁻¹.
Molarity is temperature dependent because as temperature changes, volume of the solution also changes.
Given,
3.0 moles of Saline (NaCl)
Volume of solution = 0.25L
Molarity = (No. of moles of solute ÷ Volume of solution in liters)
Molarity = 3 ÷ 0.25 = 12 M
Therefore, The molarity of a solution made from dissolving 3.0 moles of Saline (NaCl) in 0.25 L of solution is 12M.
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which of the following is a weak acid?
A) H2SO4 (Sulfuric acid)
B) HCl (Hydrochloric acid)
C) CH3COOH (Acetic acid)
D) HNO3 (Nitric acid)
correct answer is C).
Answers
A chemistry student produces 1.45 grams of silver during an experiment by reacting
2.45 grams of silver nitrate with excess copper wire. The species of copper that is formed from this single replacement reaction is copper (Il) nitrate.
A. Calculate the students theoretical yield for this experiment.
B. Determine the percent yield for the student's experiment.
C. How would you rate the student's results, most excellent or poor?
D. Identify the reactant that would be left over upon the reaction reaching completion.
Answers
A single substitution reaction a strip or zinc metal is added to a copper(II) nitrate solution. Copper will be pushed out of the solution by zinc. As a result, zinc nitrate, Zn(NO3)2, and copper metal, Cu, produced.
What is a substitution reaction reaction example?An illustration of a single substitution reaction is the reaction of potassium (K) and water (H2O). In the process, hydrogen gas (H2) is released and potassium hydroxide (KOH), a colourless solid chemical, formed. 2K + 2H2O 2KOH + H is the reaction's equation.
What other names are given to copper II nitrate?This page explains the Copper II Nitrate formula, sometimes referred to as Cupric nitrate or Copper Dinitrate formula. This inorganic substance exists as a solid with blue crystals. Cu(NO3)2 is the chemical formula for Copper II Nitrate.
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Surplus electrons travel through a conductor from the __ to the ___
Answers
Answer:
Surplus electrons travel through a conductor from the hotter end to the colder end of the conducted.
Explanation:
This is known as thermal conductivity
\(.\)
What is a volume. in your own words but be more detailed about what you say.
Answers
Answer:
volume is the amount of space in a certain object
Part B
Now decide how many different combinations of baking soda and vinegar you will try, The number of combinations must be three or more.
Answers
The many different combinations of baking soda and vinegar to try would be:
50 mL vinegar and 10 g baking soda50 ml vinegar and 5 g baking soda50 mL vinegar and 15 g of baking soda.What is the reaction of vinegar and baking soda?The reaction between vinegar and baking soda is essentially the reaction between sodium bicarbonate and acetic acid.
The equation of the reaction is given below:
Sodium carbonate + acetic acid ---> Sodium acetate + water + carbon dioxide.
It is clear that carbon dioxide gas was produced when the solid baking soda was mixed with the liquid vinegar because bubbles started to appear in the mixture as it foamed.
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LAB SUMMARY: Answer the following two questions in complete sentences. You may re-watch the lab video clips as needed. What evidence did we have that zinc was added to change the coin from copper to silver? How did the silver colored coin change to gold? Was this a chemical change or a physical change?
Answers
The change in color from silver to gold is a chemical change.
What is a a chemical change?A chemical change is one in which a new substance is formed. In this case, we can see from the video that zinc was added along with the sodium hydroxide solution and heated
Thus we know that a chemical change would cause an alteration in how the substance looks as a result of the alterations in the arrangement of atoms in the system. This rearrangement of atoms is what causes the chemical change to occur.
The color of the coin changed from silver to gold when the coin was placed on the hotplate. This could be regarded as a chemical change because an alloy was formed in the process.
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What are the components in Covellite
Answers
Covellite is a mineral that is composed mainly of sulfur(S) and copper (Cu), with occasional traces o other elements such as Iron (Fe), Nickel (Ni), and arsenic (Ar). Covellite has a chemical formula of CuS.
It is a member of the sulfide mineral group and is commonly found in the alteration process of other similar minerals that are made of CuS. Examples of such similar minerals are Chalcolite and Chalcopyrite.
The given element, Covellite has a distinct blue-black color for which it is known for. It is one of the rare minerals which is often sought out and after by mineral collectors all around the world.
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the SI unit for forces is it a newton, force, unbalanced forces, balanced forces, net forces pick on I need you help
Answers
Answer: The SI unit for force is Newtons (N).
Draw all possible lewis structures (including resonance structures for methyl azide (ch3n3 using lewis structure rules. One or more of your structures may seem unstable or unlikely; include them in your answer as long as they do not violate lewis structure rules. For each resonance structure, assign formal charges to all atoms that have formal charge. Draw all possible lewis dot structure for methyl azide. Include all hydrogen atoms and nonbonding electrons. Show the formal charges of all atoms
Answers
Structure 1:
H
|
H - C = N
|
N
|
N
Structure 2:
H
|
H - C ≡ N
|
N
|
N
Structure 3:
H
|
H - C ≡ N+
|
N-
|
N
In Structure 1, there is a double bond between the central carbon atom and one of the nitrogen atoms, and a single bond between the central carbon atom and the other nitrogen atom. In Structure 2, there is a triple bond between the central carbon atom and one of the nitrogen atoms, and a single bond between the central carbon atom and the other nitrogen atom. In Structure 3, there is a triple bond between the central carbon atom and the positively charged nitrogen atom, and a single bond between the central carbon atom and the negatively charged nitrogen atom.
All three structures satisfy the octet rule for all atoms and obey the Lewis structure rules.
For resonance structures, we can observe that Structures 1 and 2 are actually resonance structures of each other, as the double and triple bonds can be interchanged without violating any valence electron rules. Therefore, we can draw a hybrid structure that represents the average of these two resonance structures:
Hybrid Structure:
H
|
H - C = N ⇌ H - C ≡ N
|
N
|
N
In this hybrid structure, the double and triple bonds have equal bond order and the formal charges on all atoms are as follows:
Carbon: 0
Nitrogen (single bond): 0
Nitrogen (double/triple bond): 0
Hydrogen: +1
Note that the formal charge on the carbon atom is zero in all structures, and the formal charges on the nitrogen and hydrogen atoms are all either zero or +1, which are the most stable formal charges for these atoms.
Sources of error in colorimetry?
Answers
compare the laboratory and industrial testing of aspirin like the similarities and differences
Answers
A reactor, acetic acid, salicylic acid, and the use of an acetic anhydride to complete the reaction are all used in the production of aspirin.
A reactor, acetic acid, salicylic acid, and the use of an acetic anhydride to complete the reaction are all used in the production of aspirin.The ideal temperature for this reaction is 85 degrees Celsius. By using a steady heat source to maintain this temperature during the process, it is possible for the reaction to finish completely rather than partially.The solution is allowed to cool after the reaction is finished so that the crystals can form and the reaction can be finished completely.A Buchner funnel is then used to filter these crystals out. After being filtered, these crystals are rinsed with distilled water and allowed to dry. Compressing the finished substance into tablets is simple.Aspirin is produced using a reactor, acetic acid, salicylic acid, and an acetic anhydride to finish the synthesis.To learn more about the aspirin visit:
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What will most likely happen in the absence of a nucleus?
Answers
Answer:
Nucleus is the brain of the cell and controls most of its functions. Thus without a nucleus, an animal cell or eukaryotic cell will die.
Answer:
A. genetic information will not be transmitted by the cell
Explanation:
Carbon-14 has more ____
than carbon-12.
O protons
O neutrons
O atoms
or electrons
Answers
Answer:
The second one
Neutrons
Examine each of the following pie charts. Which one shows the correct makeup of Earth's atmosphere?
A
A
B
B
C
C
D
D
Answers
Answer:
Answer A
Explanation:
atmosphere is made up of approx 78% N and 21% O2
What are the postulates of Dalton's atomic theory?
Answers
Answer:
All matter consists of indivisible particles called atoms. Atoms of the same element are similar in shape and mass, but differ from the atoms of other elements. Atoms of different elements may combine with each other in a fixed, simple, whole number ratios to form compound atoms. Hope that helps : )
hello,
here is your answer:
**********
Postulates of Dalton's atomic theory:
⇒ All matter is made up of very tiny particles called atoms.
⇒ Atoms are indivisible particles, which cannot be created or destroyed in a chemical reaction.
⇒ Atoms of a given element are identical in mass and chemical properties.
⇒ Atoms of different elements have different masses and chemical properties.
⇒ Atoms combine in the ratio of small whole numbers to form compounds.
⇒ The relative number and kinds of atoms are constant in a given compound.
⇒ Atoms of the same elements can combine in more than one ratio to form more than one compound.
**********
hope this helped,
:)
Select the correct answer. Clive finds that the water coming out of the faucet is a little muddy. He concludes that the color in the water is due to the mining activity in the nearby forest. Clive shares his conclusion with his science class. His classmates question his conclusion, but Clive has no data to back up his conclusion. Which step in the scientific investigation did he miss? A. observing B. communicating results C. testing the hypothesis D. creating a hypothesis
Answers
Answer:
A. observing
Explanation:
There are various steps that are involved in a scientific investigation. Observation is the first step of the scientific investigation. In this step, a close examination is laid on the investigation. Observation is collected with the senses and the information is gathered.
In the given excerpt, Clive missed the observation part of the scientific investigation. All the other three steps were followed by Clive. He was not able to observe the situation and so was not able to provide the answers to the questions asked by his classmates.
25 Points! A flashlight uses the chemical energy stored in a battery. This chemical energy is eventually converted into which two forms of energy?
A.) Mechanical and nuclear
B.) Radiant and thermal
C.) Thermal and mechanical
D.) Nuclear and electrical
Answers
Answer:A.) Mechanical and nuclear
Explanation:
iv,e got nuthing sorry im only a kid i have to leared that yet
answer:
B) Radiant and Thermal
explanation:
"In a flashlight, chemical energy in the batteries is converted to electrical energy when the circuit including the batteries, switch and light bulb is completed. The electrical energy is converted to light (electromagnetic / radiant energy) and some heat (thermal energy) by the light bulb." -https://www.crosbyisd.org/cms/lib6/TX02216626/Centricity/Domain/392/6_9C-EnergyFormsConversions.pdf
It was suggested that, because of the jump in numbers, from chlorine to potassium, there was an element missing between them. Which element was discovered between these elements?
Answers
Answer:
Argon
Explanation:
Argon because chlorine is atomic number 17 and potassium is atomic number 19
Argon is between them thank you
Are elements matter and why?
Answers
All matter is made up of substances called elements, which have specific chemical and physical properties and cannot be broken down into other substances through ordinary chemical reactions. Gold, for instance, is an element, and so is carbon. There are 118 elements, but only 92 occur naturally.
PLEASE MARK ME BRAINLIEST.What volume of O₂ at 10.0° C and .890 atm would be required to generate 55.2 grams of NO₂?
Answers
The chemical reaction between oxygen and nitrogen dioxide has the following balanced chemical equation: 2Nitrogen dioxide + Oxygen -> 2Nitrogen dioxide
What is volume of oxygen required at 0 degree celsius and 1 atm to burn completely?Hence volume of oxygen gas measured at 0oC and 1atm, needed to burn completely 1L of propane gas under the same conditions is 5L.
According to the equation, 2 moles of Nitrogen dioxide and 1 mole of Oxygen combine to form 2 moles of Nitrogen dioxide.
We must first determine how many moles of Nitrogen dioxide 55.2 grams will produce:
mass / molar mass equals moles of Nitrogen dioxide.
Nitrogen dioxide moles are equal to 55.2 g/46.0055 g/mol.
1.200 mol Equals 1 mole of Nitrogen dioxide.
We just require half as many moles of Oxygen since 1 mole of Oxygen produces 2 moles of Nitrogen dioxide:
1.200 moles of Oxygen are equal to 0.600 moles when divided by two.
Now, we can calculate the volume of Oxygen needed using the ideal gas law:
PV = nRT
P equals pressure where= 0.890 atm
V = volume (in liters)
n = number of moles = 0.600 mol
R = gas constant = 0.08206 L·atm/mol·K
T = temperature = 10.0 + 273.15 = 283.15 K
Solving for V:
V = nRT / P
V = (0.600 mol)(0.08206 L·atm/mol·K)(283.15 K) / 0.890 atm
V = 14.2 L
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What would the concentration of an NaOH solution be if 25 moles were used and 50 L were used?
0. 5 M
0. 5 M
2 M
, 2 M
1250 M
1250 M
25 M
Answers
Answer:
0.5 M
Explanation:
To find the concentration, you take the moles and divide that by the liters;
\(\frac{moles}{liters} =\frac{25 moles}{50 L} =0.5M\)
I hope this helps!
differentiate between group and period
Answers
Answer:
A group is a vertical column of elements on the periodic table whereas a period is a horizontal row of elements on the periodic table.
4. Chemical energy is the energy stored in a
substance such as sugar. Therefore,
chemical energy is a form of
A. potential energy.
B. kinetic energy.
C. thermal energy.
D. mechanical energy.
Answers
Answer:
A.
Explanation:
Potential energy. Potential energy is energy that is stored.
suppose you are performing a hydroboration oxidation of 1-hexene to form 1-hexanol. your reaction includes 0.84 ml of 1-hexene, which has a density of 0.673 g/ml, 1.73 ml of 1.00 m borane in thf, and 1.26 ml of 30.0% m/v hydrogen peroxide. what is the theoretical yield of 1-hexanol (in g) for the reaction?
Answers
The theoretical yield of 1-hexanol (in g) for the reaction is: 102.18 g
Theoretical Yield of 1-HexanolIn the reaction for the hydroboration oxidation of 1-hexene to form 1-hexanol, the theoretical yield of 1-hexanol (in g) can be calculated by applying the formula:
Theoretical yield = (mass of limiting reactant x molecular weight of 1-hexanol) / molecular weight of limiting reactant
Given that the reaction includes 0.84 ml of 1-hexene, which has a density of 0.673 g/ml, 1.73 ml of 1.00 m borane in thf, and 1.26 ml of 30.0% m/v hydrogen peroxide. The molecular weight of 1-hexene is 84.16 g/mol, and the molecular weight of 1-hexanol is 102.18 g/mol.
To find out the limiting reactant, we need to first calculate the moles of each reactant as follows:
Moles of 1-hexene = volume x density / molecular weight = 0.84 ml x 0.673 g/ml / 84.16 g/mol = 0.00675 mol
Moles of borane = volume x concentration = 1.73 ml x 1.00 M = 0.00173 mol
Moles of hydrogen peroxide = volume x concentration = 1.26 ml x 30.0% m/v / (100 g/L) / (34.0147 g/mol) = 0.00113 mol
From the above calculations, the borane is the limiting reactant since it produces the least amount of moles of product. Therefore, the moles of 1-hexanol produced is also equal to the moles of borane used in the reaction.
Moles of 1-hexanol produced = moles of borane used = 0.00173 mol
The theoretical yield of 1-hexanol can be calculated by applying the formula:
Theoretical yield = (mass of limiting reactant x molecular weight of 1-hexanol) / molecular weight of limiting reactant= (0.00173 mol x 102.18 g/mol) / 0.00173 mol= 102.18 g
The theoretical yield of 1-hexanol is 102.18 g.
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If there are 6 waves in a 2-second time frame, what is the frequency
Answers
Answer:
3 Hz
Explanation:
frequency = \(\frac{number of waves}{time}\)
thus \(f=\frac{6}{2}\) = 3 Hz
If there are 6 waves in a 2-second time frame, the frequency is 3 Hz. When a wave travels through a medium, the frequency describes how frequently the medium's particles vibrate.
What is the frequency of a wave?The frequency identifies the frequency at which the particles of the medium vibrate as a wave passes through it.
Frequency = number of waves ÷time
The number of waves is 6 and time is 2 second
f = 6 ÷ 2
= 3
A disturbance or variation that causes energy to be transferred gradually from one point to another in a medium. It can be an elastic deformation or a change in pressure, electric potential, electric or magnetic intensity, or temperature.
Therefore, if there are 6 waves in a 2-second time frame, the frequency is 3 Hz.
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Which notation represents the largest atomic radius?
Cl
Cl^−
F
F^−
Answers
Answer:
Cl⁻ Or A
Explanation:
H2SO4 + 2NaOH → Na2SO4 + 2H2O what volume of water vapor will be produced if you start with 71.5 g of sulfuric acid and excess of sodium hydroxide
Answers
Answer:
Explanation:
Find the molar mass of H2SO4
2H = 2 * 1 = 2
S = 1 * 32 =32
O4 = 4*16 = 64
total 98
Find the number of mols in 71.5 grams
mols = given mass / molar mass.
given mass = 71.5
molar mass = 98
mols = 71.5/98
mols = 0.7296 mols of H2SO4
Find the moles of H2O
From the Balanced equation, every mol of H2SO4 produces 2 moles of H2O
mols water = 2 * 0.7296
mols water = 1.4592
That's as far as I can take you. I have to know a great deal more to get the volume of H2O