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  #1 (permalink)  
Old 04-27-2008, 07:15 AM
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Chemistry question please?

1.Sugar (151.20 grams; molar mass 342.3 g/mol) was dissolved in water. The freezing point of the solution was determined to be -4.10 deg C. How many grams of water were used to make the solution? The freezing point depression constant Kf for water is -1.86 K/m. Enter the mass of water as an integer.

2.Consider the following equilibrium at high temperature:
2H2(g) + S2(g) 2H2S(g)
Analysis of the contents of a 11.0L flask reveals that there are 1.7 moles of hydrogen gas, 2.3 moles of sulfur gas, and 3.7 moles of hydrogen sulfide gas in the flask at equilibrium. Calculate the equilibrium constant K.

3.The equilibrium constant Kc for the following reaction is 5.70.
H2(g) + CO2(g) H2O(g) + CO(g)
Initially, 1.05 moles each of H2 and CO2 are injected into a 4.50 L flask. Calculate the concentration of the H2O(g) at equilibrium.
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  #2 (permalink)  
Old 04-27-2008, 07:18 AM
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Have you worked out any rate equation for 2 or 3?
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