Wednesday
July 23, 2014

Homework Help: Chemistry

Posted by Patrick on Thursday, March 3, 2011 at 10:36pm.

CaCO3(s) <--> CaO(s) + CO2 (g)

A 5.9-gram sample of CaCO3 (molar mass = 100.) is placed in an evacuated 2.00L container and heated to 200^oC. Equilibrium is reached when 5.15% of the CaCO3 has decomposed.

1)Write the Kp expression for this reaction and calculate its value at 200K.

2)How many carbon dioxide molecules are there in the container at equilibrium?

3)When the reaction reaches equilibrium what % of the solid in the container is CaO by mass?

4)If the volume of the container is decreased after equilibrium is reached, but kept at 200^oC, will the mass of CaO increase or decrease from its value at equilibrium? Explain.

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