What is the value of the equilibrium constant for the reaction between each pair
ID: 1033889 • Letter: W
Question
What is the value of the equilibrium constant for the reaction between each pair at 25°C? (I included my inccorrect answers!)
(a) Cl2(g) and Br?(aq)
6.2 x109 Incorrect: Your answer is incorrect. Your response is within 10% of the correct value. This may be due to roundoff error, or you could have a mistake in your calculation. Carry out all intermediate results to at least four-digit accuracy to minimize roundoff error.
(b) Cr(s) and Cu2+(aq)
2.88 x 10109 Incorrect: Your answer is incorrect. Your response is within 10% of the correct value. This may be due to roundoff error, or you could have a mistake in your calculation. Carry out all intermediate results to at least four-digit accuracy to minimize roundoff error.
Explanation / Answer
a) Cl2(g) + 2Br-(aq) ----> 2Cl-(aq) + Br2(l)
E0cell = E0cathode - E0anode
= 1.36 - 1.0873
= 0.2727 v
dG0 = -nFE0cell
= -2*96500*0.2727
= -52.63 kj/mol
DG0 = - RTlnK
-52630 = - 8.314*298lnk
K = equilibrium constant = 1.68*10^9
b)
2Cr(s) + 3Cu^2+(aq) ----> 2Cr^3+(aq) + 3Cu(s)
E0cell = E0cathode - E0anode
= 0.34 - (-0.74)
= 1.08 v
dG0 = -nFE0cell
= -6*96500*1.08
= -625.32 kj/mol
DG0 = - RTlnK
-625320 = - 8.314*298lnk
K = equilibrium constant = 4.1*10^109
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