Calculating K Using Non-equilibrium Values

Lo-tech!

There's nothing like a paper and pencil for working out a question.  Just because these questions are on a computer, don't forget the obvious.  You need to write out your solution on paper!

Problems:

1. 0.0689 mol of NO2 (g) is added to an evaculated 1L container.   When equilibrium is reached at 25 șC, the concentration of N2O4 (g) = 2.80 x 10-2 mol/L.  What is the value of K?

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2. Steam reforming of methane is used extensively in the petroleum industry to generate hydrogen gas.  If the reaction is assumed to be in equilibrium

H2O (g) + CH4 (g) 3H2 (g) + CO (g)

then what is K at 1000 șC if equal concentrations of water and methane of 0.5 mol/L are fed into a reactor, and in the product stream the concentration of CO (g) is 0.221 mol/L?

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3. 0.25 mol of NOCl was initially in a 2.0 L container at 500 șC.  After equilibrium it is found that the concentration of NOCl has dropped to 0.090 mol/L.

2NOCl (g) 2NO (g) + Cl2 (g)

What is K?

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4. 4.00 x 10-2 mol of COCl2 (phosgene) is placed in a 1.0 L container and heated to 500K.  At this temperature, 4.5% of the phosgene has dissociated into CO and Cl2.  What is K for the reaction?

COCl2 (g) CO (g) + Cl2 (g)

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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?

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