JEE Advanced 2020 Chemistry question

ChemistryElectrochemistryJEE Advanced 2020

Consider a 70% efficient hydrogen-oxygen fuel cell working under standard conditions at 1 bar and 298 K. Its cell reaction is

H_2(g) + O_2(g) → H_2O(l).

The work derived from the cell on the consumption of mol of is used to compress 1.00 mol of a monoatomic ideal gas in a thermally insulated container. What is the change in the temperature (in K) of the ideal gas? The standard reduction potentials for the two half-cells are given below.

O_2(g) + 4H^+(aq) + → 2H_2O(l), = 1.23\ V,

2H^+(aq) + → H_2(g), = 0.00\ V.

Use , .

Answer: 13.32

Solution

V and electrons per mole of . Maximum work per mole of : J. For mol: J; at 70% efficiency the useful work is

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Question ID VK-033764