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Discus: SAT/ACT Tests and Test Preparation: May 2003 Archive: AP CHEMISTRY QUESTION
By Futuredoctor (Futuredoctor) on Sunday, May 18, 2003 - 08:47 pm: Edit

Hi, I have an equilibrium problem that I am having trouble with.

2NaHCO3---Na2CO3 + H2O + CO2

Solid sodium hydrogen carbonate decomposes on heating according to the equation above.

a) A sample of 100 grams of solid hydrogen carbonate was placed in a previously evacuated rigid 5.00 liter container and heated to 160C. Some of the original solid remained and the total pressure in the container was 7.78 atmosphers when equilibrium was reached. CAlculate the number of moles of water present at equilibrium.

b) How many grams of the original solid remain in teh container under the conditions described in a?

c) Write the equilibrium expression for the equilibrium constant, Kp, and calculate its value for the reaction under the conditions in a

d) if 110 grams of solid NaHCO3 had been placed in the 5.00 liter container and heated to 160 C, what would the total pressure have been at equilibrium?

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