The Reaction Quotient Video Lessons

Example

# Problem: When 0.100 mol of CaCO3(s) and 0.100 mol of CaO(s) are placed in an evacuated sealed 10.0-L container and heated to 385 K, PCO2 = 0.220 atm after equilibrium is established:   CaCO3(s) ⇌ CaO(s) + CO2(g) An additional 0.300 atm of CO2(g) is pumped in. What is the total mass (in g) of CaCO 3 after equilibrium is re-established?

###### FREE Expert Solution

Step 1. Calculate for the molarity of CO2 at equilibrium

Step 2. Setup the Keq expression

Recall that the equilibrium constant is the ratio of the products and reactants.  We use Kp when dealing with pressure and Kc when dealing with concentration:

Recall CaCO3 and CaO are not included in the Kp expression since they are both in solid state

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###### Problem Details

When 0.100 mol of CaCO3(s) and 0.100 mol of CaO(s) are placed in an evacuated sealed 10.0-L container and heated to 385 K, PCO2 = 0.220 atm after equilibrium is established:

CaCO3(s) ⇌ CaO(s) + CO2(g)

An additional 0.300 atm of CO2(g) is pumped in. What is the total mass (in g) of CaCO 3 after equilibrium is re-established?