|Feb13-09, 02:03 PM||#1|
w_max & T in fuel cell
1. The problem statement, all variables and given/known data
2 H2(g) + O2(g) 2 H2O(l) K = 1.28e83
As temperature increases, does the maximum amount of work obtained from the fuel cell reaction increase, decrease, or remain the same?
2. Relevant equations
1. G = -RTln(K)
2. dG = dH - tdS
3. w_max = dG
3. The attempt at a solution
Okay, using formation values, I calculated that for this reaction, both dH and dS are < 0.
If dG = w_max (eq. 3), then w_max = -RT ln K (1 and 3)
Since ln(K) is positive, the larger the T, the more negative w_max.
Thus, as T increases, w_work decreases?
Is that right? Thanks.
|cell, electrochemistry, fuel, w_max|
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