Chapter 17.10, Problem 17.17P

(a)

Interpretation Introduction

Interpretation:

The standard potential for the cell reaction in hydrogen-oxygen fuel cell used in space vehicles has to be given.

Concept Introduction:

Standard cell potential:

The standard cell potential is the measure of individual potential of reversible electrode at standard state.  The conditions that makes cell potential to qualify as standard cell potential is when all the reactants and the product are in standard state that is solutes at $\text{1}\text{M}$ concentrations, partial pressure of gases at $\text{1}\text{atm,}$ solids and liquids in pure state, all at $\text{25°C}\text{.}$

(b)

Interpretation Introduction

Interpretation:

The standard potential for the cell reaction in proton exchange membrane fuel cell used in electric automobiles has to be given.

Concept Introduction:

Standard cell potential:

The standard cell potential is the measure of individual potential of reversible electrode at standard state.  The conditions that makes cell potential to qualify as standard cell potential is when all the reactants and the product are in standard state that is solutes at $\text{1}\text{M}$ concentrations, partial pressure of gases at $\text{1}\text{atm,}$ solids and liquids in pure state, all at $\text{25°C}\text{.}$