Metal plating is done by passing current through a metal solution. For example, an item can become gold plated by attaching the item to a power source and submerging it into a Au3 solution. The item itself serves as the cathode, at which the Au3 ions are reduced to Au(s). A piece of solid gold is used as the a node and is also connected to the power source, thus completing the circuit.

Required:
What mass of gold is produced when 15.0A of current are passed through a gold solution for 15.0min ?

Answers

Answer 1

Answer:

9.18g

Explanation:

Step 1: Write the reduction half-reaction

Au³⁺(aq) + 3 e⁻ ⇒ Au(s)

Step 2: Calculate the mass of gold is produced when 15.0A of current are passed through a gold solution for 15.0min

We will use the following relationships:

1 min = 60 s1 A = 1 C/s1 mole of electrons has a charge of 96486 C (Faraday's constant).1 mole of Au is produced when 3 moles of electrons circulate.The molar mass of Au is 196.97 g/mol.

The mass of gold produced is:

[tex]15.0 min \times \frac{60s}{1 min} \times \frac{15.0C}{1s} \times \frac{1 mol e^{-} }{96486C} \times \frac{1molAu}{3 mol e^{-} } \times \frac{196.97gAu}{1molAu} = 9.18gAu[/tex]


Related Questions

Calculate the number of molecules in 14.3 mol H2O.

Answers

Answer:

I don't get it

Explanation:

please explain more about question

In a rush, a student only measured the mass of the empty beaker once before beginning
the experiment and one more time after the entire experiment was finished. The mass of
the empty beaker was found to be 0.123g less at the end of the experiment. What
happened?

Answers

Answer:

The student measured the cup and got an incorrect answer

Explanation:

because he was in a rush.

Magnesium nitride, Mg3N, undergoes a thermo decomposition reaction to form magnesium metal and nitrogen gas.

a. True
b. False

Answers

Answer:

a. True

Explanation:

Magnesium nitride, Mg₃N, is a binary salt. Upon heating, it decomposes into magnesium metal and nitrogen gas. The unbalanced equation is:

Mg₃N(s) ⇒ Mg(s) + N₂(g)

We can balance it with the trial and error method. First, we will balance N atoms by multiplying Mg₃N by 2.

2 Mg₃N(s) ⇒ Mg(s) + N₂(g)

Then, we get the balanced equation by multiplying Mg by 6.

2 Mg₃N(s) ⇒ 6 Mg(s) + N₂(g)

9.3 x 10^3 moles of SmO in grams?

Answers

Answer:

1.5 grams?

Explanation:

Match the solutions to the descriptions of the freezing points.a. One mole of the ionic compound Na3PO4 dissolved in 1000 g H2O b. One mole of the ionic compound CuSO4 dissolved in 1000 g H2O c. One mole of the nonelectrolyte C6H12O6 dissolved in 1000 g H2O1. Highest freezing point 2. Intermediate freezing point 3. Lowest freezing point

Answers

Explanation:

Depression in Freezing point

= Kf × i × m

where m is molality , i is Van't Hoff factor, m = molality

Since molality and Kf remain the same

depression in freezing point is proportional to i

i= 2 for CuSO4 ( CuSO4----------> Cu+2 + SO4-2

i=1 for C2h6O

i= 3 for MgCl2 ( MgCl2--------> Mg+2+ 2Cl-)

So the freezing point depression is highest for MgCl2 and lowest for C2H6O

so freezing point of the solution = freezing point of pure solvent- freezing point depression

since MgCl2 has got highest freezing point depression it will have loweest freezing point and C2H6O will have highest freezing point

31 points PLS HELP!

Sedimentary rocks are formed by ...
Group of answer choices

Sediments being broken down over time

Sediment layers being compressed by the layers upon layers of sediment forming.

Sediments being cemented together.

All of the Above

Answers

Answer:

All the above I believe

Explanation:

Answer:

all of above!

Explanation:

Im pretty sure, because all of them happen when forming a sedimentary rock.

Certain species of fish are unsafe to consume in high quantities because these fish
a. are endangered species
b. have high levels of metals in them from cancer- causing pesticides
c. ingest other fish that are poisonous to humans
d. contain vitamins that aren't water-soluble and can cause toxicity

Answers

Answer:B

Explanation: Pennfoster answer

what are the compounds that cause acid rain?​

Answers

Answer:

Explanation:

Its a chemical reaction that begins when compounds like sulfur dioxide and nitrogen oxides are released into the air. These substances  rise  high into the atmosphere in which they mix and react with water, oxygen, and other chemicals to form more acidic pollutants.

Answer:

Explanation:

Acid rain is caused by a chemical reaction that begins when compounds like sulfur dioxide and nitrogen oxides are released into the air. These substances can rise very high into the atmosphere, where they mix and react with water, oxygen, and other chemicals to form more acidic pollutants, known as acid rain.

Kantahan moko sa lobby ml tayo babae 11 years old mayhem folow me 908723751 Mobile Legends Bang bang​

Answers

Answer:

hi which language is this???

I can't understand

Answer:

Filipino hello pari omsim

Question 2 (1 point)
An object's gravitational force depends primarily on the object's
a
density
mass
b
oc
momentum

Answers

Answer: An object's gravitational force depends primarily on the object's mass.

Explanation:

According to the Universal law of gravitation, every object whether is it is having large r small mass tends to exert a force on every other object, therefore this force is known as gravitational force.

Formula to calculate gravitational force is as follows.

[tex]F = \frac{G \times m_{1} \times m_{2}}{r^{2}}[/tex]

where,

F = Gravitational force

G = Gravitational constant = [tex]6.674 \times 10^{-11} m^{3}/kg s^{2}[/tex]

[tex]m_{1}[/tex] = mass of object 1

[tex]m_{2}[/tex] = mass of object 2

r = distance between the centers of the objects

Therefore, it means that gravitational force of an object primarily depends on an object's mass.

Thus, we can conclude that an object's gravitational force depends primarily on the object's mass.

match the molecular shapes to the correct Lewis structures


trigonal pyramid
trigonal planar
bent
tetrahedral
linear

Answers

Answer:

Match up correct answers:

1) trigonal planar

2) tetrahedral

3) trigonal pyramid

4) linear

Explanation:

(correct answers on portal and edmentum users)

Hope I was helpful, have a great day and good luck :)

AlH₃ - trigonal planar

CH₂F₂ - tetrahedral

PH₃ - trigonal pyramidal

O₃ - bent

What is a Lewis structure?

The valence shell electrons in a molecule are depicted in an extremely simplified manner by a Lewis Structure. It is used to demonstrate how the electrons in a molecule are positioned around particular atoms. Electrons are shown as dots or, in the case of a bond, as a line connecting the two atoms.

How do you determine the molecular shape?Depict the Lewis Structure.Determine if the electron groups are in bond pairs or are lone pairs by counting the number of electron groups. Keep in mind that lone pairs and bonds are both included in electron groups!The electron-group geometry is named. (Specify if it is octahedral, tetrahedral, trigonal-bipyramidal, or linear.)The molecular geometry is determined by examining the locations of the surrounding atomic nuclei. (Count the number of lone pairs)

Learn more about molecular geometry here:

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When of glycine are dissolved in of a certain mystery liquid , the freezing point of the solution is lower than the freezing point of pure . On the other hand, when of ammonium chloride are dissolved in the same mass of , the freezing point of the solution is lower than the freezing point of pure . Calculate the van't Hoff factor for ammonium chloride in .

Answers

The given question is incomplete. The complete question is:

When 282. g of glycine (C2H5NO2) are dissolved in 950. g of a certain mystery liquid X, the freezing point of the solution is 8.2C lower than the freezing point of pure X. On the other hand, when 282. g of ammonium chloride are dissolved in the same mass of X, the freezing point of the solution is 20.0C lower than the freezing point of pure X. Calculate the van't Hoff factor for ammonium chloride in X.

Answer:  the van't Hoff factor for ammonium chloride is 1.74

Explanation:

Depression in freezing point is given by:

[tex]\Delta T_f=i\times K_f\times m[/tex]

[tex]\Delta T_f=T_f^0-T_f=8.2^0C[/tex] = Depression in freezing point  

[tex]K_f[/tex] = freezing point constant = ?

i = 1 ( for non electrolyte)

m= molality

[tex]8.2^0C=1\times K_f\times \frac{\text{mass of solute}}{\text{molar mass of solute}\times \text{weight of solvent in kg}}[/tex]

Weight of solvent (X)= 950 g = 0.95 kg

Molar mass of solute (glycine) = 75.07 g/mol

Mass of solute (glycine) = 282 g

[tex]8.2^0C=1\times K_f\times \frac{282g}{75.07g/mol\times 0.95kg}[/tex]

[tex]K_f=2.07[/tex]

ii) [tex]20.0^0C=i\times \times \frac{\text{mass of solute}}{\text{molar mass of solute}\times \text{weight of solvent in kg}}[/tex]

Weight of solvent (X)= 950 g = 0.95 kg

Molar mass of solute (ammonium chloride) = 53.49 g/mol

Mass of solute (ammonium chloride) = 282 g

[tex]20.0^0C=i\times 2.07\times \frac{282g}{53.49g/mol\times 0.95kg}[/tex]

[tex]i=1.74[/tex]

Thus the van't Hoff factor for ammonium chloride is 1.74

Calculate the value of ΔG° at 25°C for the formation of POCl3 from its constituent elements,

P2 (g) + O2 (g) + 3Cl2 (g) --> 2POCl3 (g)

A. -606.2 kJ/molrxn

B. +1108.7 kJ/molrxn

C. -1108.7 kJ/molrxn

D. +606.2 kJ/molrxn

Answers

The correct answer is

C. -1108.7 kJ/mol rxn

From the table values, the standard Gibbs free energy change for the formation of POCl₃ is -1108.7 kJ/mol

What is Gibbs free energy ?

We can calculate ΔG° for the reaction using the following formula:

ΔG° = ΣnΔG°f(products) - ΣnΔG°f(reactants)

where ΔG°f is the standard Gibbs free energy of formation for each compound and n is the stoichiometric coefficient of each compound in the balanced chemical equation.

We can look up the values of ΔG°f for each compound in tables of thermodynamic data. At standard conditions (25°C and 1 atm pressure), the values are:

ΔG°f (POCl₃) = -558.9 kJ/mol

ΔG°f (P₂) = 0 kJ/mol

ΔG°f (O₂) = 0 kJ/mol

ΔG°f (Cl₂) = 0 kJ/mol

Plugging these values into the formula, we get:

ΔG° = (2 mol)(-558.9 kJ/mol) - (1 mol)(0 kJ/mol) - (1 mol)(0 kJ/mol) - (3 mol)(0 kJ/mol)

ΔG° = -1117.8 kJ/mol

Therefore, the correct option  is C. -1108.7 kJ/molrxn. Note that this answer differs slightly from the calculated value because the given choices are rounded to one decimal place.

Find more on Gibbs energy:

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7
State two signification of melting?​

Answers

The two liquids are different and so the melting points are different only because one represents an intermediate stage. It was a melting-point suppression effect, just like salt and ice, but it was much larger than anyone on the team had thought possible.

pls help i need help help

Answers

Answer:

and is capillaries

Explanation:

hope it helps

what is chemical name of ghee​

Answers

Answer. Chemical formula of ghee: (C17H33 Coo)3 C3H5 • Chemical Reaction: (C17H31Coo)3 C3H5 + 3H2 (C17H33 Coo)3 C3H5

The tertiary structure of a protein is a complex arrangement formed as the polypeptide chain folds and twists.

a. True
b. False

Answers

Answer:

True

Explanation:

The tertiary structure of a protein is a complex arrangement formed as the polypeptide chain folds and twists.

This folding & twisting of polypeptide chain leading to its complex structure, is true about tertiary structure of protein. It occurs due to different interactions between side chains of amino acids.

TRUE or FALSE: The only way to see a recessive trait is to inherit 2 recessive
alleles.

Answers

Answer:

false it's more than two

to find the mass in g of 3 moles Al .

Answers

Answer:

81 gm

Explanation:

The mass of 1 mole is 27 gSo, Mass of 3 moles of Aluminium would be 3 × 27 = 81 gm

Thus mass of 3 Moles of Aluminium is 81 gm.

what is a major crack in the earth's surface?

Answers

Answer:

A crack in earth's crust is called a fault also known as a "fracture"

A crack in the earth's crust is called a fault.
Faults are also referred to as fractures.

According to the following reaction, how many grams of hydrogen
gas are required for the complete reaction of 32.5 grams of nitrogen
gas?

nitrogen (g) + hydrogen (g) — ammonia (g)

…grams hydrogen gas

Answers

Answer:

7.03 g

Explanation:

Step 1: Write the balanced synthesis reaction

N₂(g) + 3 H₂(g) ⇒ 2 NH₃(g)

Step 2: Calculate the moles corresponding to 32.5 g of N₂

The molar mass of N₂ is 28.01 g/mol.

32.5 g × 1 mol/28.01 g = 1.16 mol

Step 3: Calculate the number of moles of H₂ needed to react with 1.16 moles of N₂

The molar ratio of N₂ to H₂ is 1:3. The moles of H₂ needed are 3/1 × 1.16 mol = 3.48 mol.

Step 4: Calculate the mass corresponding to 3.48 moles of H₂

The molar mass of H₂ is 2.02 g/mol.

3.48 mol × 2.02 g/mol = 7.03 g

SOMEONE HELP ME
1. How many grams of C are present in 4.86 grams of carbon dioxide
?
grams C.
2. How many grams of carbon dioxide contain 1.73 grams of O ?
grams carbon dioxide.

Answers

Answer:

1. 1.33 gram of carbon

2. 2.38g of carbon dioxide

Explanation:

From the given information:

Total amount of CO₂ = 4.86 grams

Atomic mass of C = 12 g/mole

molar mass of CO₂ = 44 g/mole

The mass of the Carbon (C) in grams is:

[tex]= Total\ amount \ of \ CO_2 \times \dfrac{12 \ g/mol}{44 \ g/mol}[/tex]

[tex]= 4.86 \ g \times \dfrac{12 \ g/mol}{44 \ g/mol}[/tex]

= 1.33 gram of carbon

2.

Here, the total amount of CO₂ = unknown

Atomic mass of O₂ = 32 g/mole

molar mass of CO₂ = 44 g/mole

amount of oxygen = 1.73 g

The mass of CO₂ = [tex]Total \ amount \ of \ O_2 \times \dfrac{44 \ g/mol}{32\ g/mol}[/tex]

[tex]=1.73 \times \dfrac{44 \ g/mol}{32\ g/mol}[/tex]

= 2.38 g of carbon dioxide

18. If I need to dilute a 12 M hydrochloric acid solution and make 300 mL of a 0.100 solution, how
much of the 12 M hydrochloric acid do I need?

Answers

Explanation:

A 300-ml of 0.100M HCl solution contains

0.100M HCl = (0.100 mol HCl/L) × (0.300 L)

----> 0.03 mol HCl

So we need to find the volume of 12M HCl solution that contains 0.03 mol HCl

0.03 mol HCL = (12 mol HCl/1 L)×V

or

V = (1 L × 0.03 mol HCl)/(12 mol HCl)

= 0.0025 L

= 2.5 ml

So you need 2.5 ml of 12M HCl to be diluted with distilled water to 300 ml in order to get a 0.100M HCl solution.

2. Acceleration is______
proportional to mass,

Answers

Answer:

Inversely

Explanation:

The acceleration of an object as produced by a net force is directly proportional to the magnitude of the net force, in the same direction as the net force, and inversely proportional to the mass of the object.


Nitrogen-fixing bacteria convert atmospheric nitrogen into forms of nitrogen that living things can use.
Please select the best answer from the choices provided
•T
•F

Answers

Answer:

I know im late but its true

Explanation:

E2020 edge

Answer:

true

Explanation:

A student is titrating 50ml of 2.5M HI with 1.23M NaOH. How many milliliters of base are added to reach the
equivalence point?

Answers

Answer:

101.6ml

Explanation:

Using the formula;

CaVa = CbVb

Where;

Ca = concentration of acid (M)

Cb = concentration of base (M)

Va = volume of acid (ml)

Vb = volume of base (ml)

Based on the information as follows:

Ca = 2.5M

Cb = 1.23M

Va = 50ml

Vb = ?

Using CaVa = CbVb

2.5 × 50 = 1.23 × Vb

125 = 1.23Vb

Vb = 125/1.23

Vb = 101.6ml

If a particular ore contains 56.3 % % calcium phosphate, what minimum mass of the ore must be processed to obtain 1.00 kg k g of phosphorus?

Answers

Answer:

34.44 kg

Explanation:

First we convert 1.00 kg of phosphorus (P) into moles, using its molar mass:

1.00 kg ÷ 32 kg/kmol = 0.03125 kmol P

Then we convert 0.03125 kmoles of P into kmoles of Ca₃(PO₄)₂:

0.03125 kmol P * [tex]\frac{2kmolCa_3(PO_4)_2}{2kmolP}[/tex] = 0.0625 kmol Ca₃(PO₄)₂

Now we calculate the mass of 0.0625 kmoles of Ca₃(PO₄)₂:

0.0625 kmol Ca₃(PO₄)₂ * 310.18 kg/kmol = 19.39 kg

Finally we calculate the required mass of the ore, using the definition of content percentage:

% content = Mass of calcium phosphate / mass of ore * 100 %56.3 % = 19.39 kg / mass of ore * 100%Mass of Ore = 34.44 kg

The total pressure in a tank is filled with a mixture of gases : Oxygen, Helium, and Argon is 15.3 atm. The P(He) = 3.2 atm, P(O) = 7.4 atm, what is the P(Ar) in the tank?

Answers

Answer:

4.7 atm

Explanation:

From the question given above, the following data were obtained:

Total pressure (P) = 15.3 atm

Pressure of Helium, P(He) = 3.2 atm

Pressure of Oxygen, P(O) = 7.4 atm

Pressure of Argon, P(Ar) =?

The pressure of Argon, P(Ar) in the tank can be obtained as illustrated below:

P = P(He) + P(O) + P(Ar)

15.3 = 3.2 + 7.4 + P(Ar)

15.3 = 10.6 + P(Ar)

Collect like terms

15.3 – 10.6 = P(Ar)

4.7 = P(Ar)

P(Ar) = 4.7 atm

Therefore, the pressure of Argon, P(Ar) in the tank is 4.7 atm

does the moon really change shape? why

Answers

The Moon doesn't emit (give off) light itself, the 'moonlight' we see is actually the Sun's light reflected off the lunar surface. So, as the Moon orbits the Earth, the Sun lights up different parts of it, making it seem as if the Moon is changing shape.

Which of the following indicates that a chemical equation is balanced?
a. The numbers of atoms of each element are the same on both sides of the equation.
b. All of the coefficients are the same.
C. The numbers of molecules on each side of the equation are equal.
d. The sums of the coefficients on each side of the equation are equal.

Answers

d. because to balance an equation all the elements have to have the same number
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