Calculate the Potential of The Cell Exam Practice

 

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Equations:

 

 

1. You discover a new planet. You discover two new elements A and D on this new planet. The molar masses of these new elements are determined to be:

Molar Mass of A = 50 g/mol

Molar Mass of D = 60 g/ mol

The standard reduction potentials for the cations of these new elements are calculated to be:

You construct to set up a galvanic cell to power your appliances using elements A and D.

The A-D battery is constructed as follows at 298 K:

Each electrode has a mass of 200 g.

a) Calculate the potential of the cell when the battery is first connected. (4pt)

b) Calculate the cell potential after 10.0 A of current has been produced for 20.0 h. (The volume of solution in each half cell is 1.00 L) (6pt)

c) Calculate each electrode’s mass after 20.0 h. (4 pt)

d) Calculate the time this battery can remain on while delivering a current of 10.0 A before it is no longer functional. (5 pt)

2. This planet contains oxygen but also contains new elements: A, X, and Z. The following reaction: occurs at. Data is collected and present in the table below. (6 pt)

, kJ mol-1

, kJ mol-1

Element

-20

-50

A

-100

-90

X

-210

-300

Z

a) Calculatefor this reaction. (6 pts)

b) Is this reaction spontaneous at the given temperature? If it is spontaneous, is the reaction entropy drive or enthalpy driven? Explain all answers. (3 pts)

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