Question

Calculate the mass of Li formed by electrolysis of molten LiCl
by a current of 8.5×10^{4} A flowing for a period of 28 h .
Assume the electrolytic cell is 84 % efficient.

Express your answer using two significant figures.

(b) What is the minimum voltage required to drive the reaction?

Express your answer using two significant figures.

Answer #1

Calculate the mass of Li formed by electrolysis of molten LiCl
by a current of 7.7×104 A flowing for a period of 25 h .
Assume the electrolytic cell is 79 % efficient.
Express your answer using two significant figures. Answer in
terms of gLi
Part B
What is the minimum voltage required to drive the reaction?
Express your answer using two significant figures.

Elemental calcium is produced by the electrolysis of molten
CaCl2.
Part A
What mass of calcium can be produced by this process if a
current of 6100 A is applied for 36 h ? Assume that the
electrolytic cell is 72 %efficient.
Express your answer using two significant figures.
Part B
What is the minimum voltage needed to cause the
electrolysis?
Express your answer using three significant figures.

Copper can be electroplated at the cathode of an electrolysis
cell by the half-reaction.
Cu2+(aq)+2e??Cu(s)
How much time would it take for
321mg of copper to be plated at a current of 7.1A ?
Express your answer using two significant figures.

Copper can be electroplated at the cathode of an electrolysis
cell by the half-reaction. Cu2+(aq)+2e−→Cu(s) Part A How much time
would it take for 330 mg of copper to be plated at a current of 6.2
A ? Express your answer using two significant figures. t =

Find the minimum kinetic energy needed for a
3.8×104-kgkg rocket to escape the Moon.
Express your answer using two significant figures.
Part B
Find the minimum kinetic energy needed for a
3.8×104-kgkg rocket to escape the Earth.
Express your answer using two significant figures.

Which of the following reactions don't occur spontaneously and
can be brought about only through electrolysis, assuming that all
reactants and products are in their standard states?
(a) 2H2O(l)→2H2(g)+O2(g) [in 1 M H+(aq)]
(b) Zn(s)+Fe2+(aq)→Zn2+(aq)+Fe(s)
(c) 2Fe2+(aq)+I2(s)→2Fe3+(aq)+2I−(aq)
(d) Cu(s)+Sn4+(aq)→Cu2+(aq)+Sn2+(aq)
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All attempts used; correct answer displayed
Correct answer is a,c,d
Part B
For the reaction (a), what is the minimum
voltage required?
Express your answer to three decimal places and include the
appropriate units.
E∘cell =
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CaO(s)−−−−−−+CO2(g)→CaCO3(s)
Express your answer using two significant figures.
For each reaction, calculate the mass (in grams) of the product
formed when 2.9 g of the underlined reactant completely reacts.
Assume that there is more than enough of the other reactant.
Ba(s)−−−−−+Cl2(g)→BaCl2(s)
Express your answer using two significant figures.
2Mg(s)−−−−−+O2(g)→2MgO(s)
Express your answer using two significant figures.
4Al(s)−−−−−+3O2(g)→2Al2O3(s)
Express your answer using two significant figures.

Calculate ΔG∘rxn and E∘cell at 25∘C for a redox reaction with n
= 3 that has an equilibrium constant of K = 5.1×10−2.
Part A
Gxrn= ___ kJ
Express your answer using two significant figures
Part B
E*cell=____ V
Express your answer using two significant figures.

Calculate the molarity of each solution.
(1)1.81 mol of LiCl in 32.4 L of solution
(2)0.109 mol of LiNO3 in 6.6 L of solution
(3) 0.0386 mol of glucose in 84.8 mL of solution
To what volume should you dilute 85 mL of a 11.5 M H2SO4
solution to obtain a 1.95 M H2SO4 solution?
Express your answer using two significant figures.

For each of the reactions, calculate the mass (in grams) of the
product formed when 15.82 g of the underlined reactant completely
reacts. Assume that there is more than enough of the other
reactant.
Express your answer using four significant figures.
1) 2K(s)+Cl2(g)−−−−−→2KCl(s)
2) 2K(s)+Br2(l)−−−−−→2KBr(s)
3) 4Cr(s)+3O2(g)−−−−−→2Cr2O3(s)

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