Consider the following reaction:
CH4 (g) + 2H2S (g) ↔ CS2 (g) + 4H2 (g)
A reaction mixture initially contains 0.680 M CH 4 and 0.520 M H2S. When equilibrium is reached the concentration of H2 is determined to be 0.250 M. What equilibrium concentration of H 2S?
a. 0.270 M
b. 0.583 M
c. 0.0200 M
d. 0.395 M
e. 0.458 M
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