If a fuel cell, methanol is used as fuel and oxygen gas is used as an oxidiser. The reaction is CH3OH(l)+32O2(g)→CO2(g)+2H2O(g) At 298 K standard Gibb’s energies of formation for CH3OH(l),H2O(l), and CO2(g) are –166.2, –237.2 and −394.4 kJ mol−1, respectively. If the standard enthalpy of combustion of methanol is –726 kJ mol−1, the efficiency of the fuel cell will be:

If a fuel cell, methanol is used as fuel and oxygen gas is used as an

1.	If a fuel cell, methanol is used as fuel and oxygen gas is used as an oxidiser. The reaction is CH3OH(l)+32O2(g)→CO2(g)+2H2O(g) At 298 K standard Gibb’s energies of formation for CH3OH(l),H2O(l), and CO2(g) are –166.2, –237.2 and −394.4 kJ mol−1, respectively. If the standard enthalpy of combustion of methanol is –726 kJ mol−1, the efficiency of the fuel cell will be:
Answer» If a fuel cell, methanol is used as fuel and oxygen gas is used as an oxidiser. The reaction is $C H_{3} O H_{(l)} + \frac{3}{2} O_{2} (g) \to C O_{2} (g) + 2 H_{2} O (g)$ At $298 K$ standard Gibb’s energies of formation for $C H_{3} O H (l), H_{2} O (l), and C O_{2} (g)$ are $- 166.2, - 237.2$ and $- 394.4 {kJ mol}^{- 1},$ respectively. If the standard enthalpy of combustion of methanol is $- 726 {kJ mol}^{- 1}$ , the efficiency of the fuel cell will be: