In a fuel cell methanol is used as fuel and oxygen gas is used as an oxidizer. The reaction is At 298 K standard Gibb's energies of formation for and are and respectively. If standard enthalpy of combustion of methanol is , find the efficiency (in %

Question

In a fuel cell methanol is used as fuel and oxygen gas is used as an oxidizer. The reaction is $C H_{3} O H (l) + \frac{3}{2} O_{2} (g) \to C O_{2} (g) + 2 H_{2} O (l)$

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 $- 394.4 k J m o l^{- 1}$ respectively. If standard enthalpy of combustion of methanol is $- 726 k J m o l^{- 1}$ , find the efficiency (in %) of the fuel cell:

Smart Achievers · Accepted Answer

(97)

$Δ G = Δ G_{p} - Δ G_{r}$

Solution

Ans.
(97)

$Δ G = Δ G_{p} - Δ G_{r}$

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Solution

Ans. (97) ΔG=ΔGp-ΔGr

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Ans.
(97)

$Δ G = Δ G_{p} - Δ G_{r}$