Problem 5

Consider the following equilibrium:

2H2 (g) + S2 (g) 2H2S (g)

2.50 mol of H2S is placed in a 10 L flask, and heated to a temperature of 100 șC.  At this temperature, after equilibrium is reached, the flask is found to contain 0.718 mol of H2 (g).  What is K?

1. Be careful in this problem.  You are given information as if you started with H2S (g) as a reactant, yet it is on the product side of the equation.  What is the starting concentration of H2 (g)? 

2. What is the starting concentration of H2S (g)?

3. Which of the following is the correct value for the R cell for H2 in the IRE table?

a) +0.718   b) +0.0718    c)  +0.0359       d) none of these are right

4. What is the calculated value for K? 

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