The reaction CO2(g) + C(s) 2 CO(g) has Kp = 5.78 at 1200K. Calculate the total pressure at equilibrium when 4.45 g of CO2 is introduced into a 10.0-L container and heated to 1200 K in the presence of 2.00 graphite. Repeat the calculation of the part above in the presence of 0.50 g of graphite.

Question

The reaction CO2(g) + C(s) <=> 2 CO(g) has Kp = 5.78 at 1200K.

Calculate the total pressure at equilibrium when 4.45 g of CO2 is introduced into a 10.0-L container and heated to 1200 K in the presence of 2.00 graphite.

Repeat the calculation of the part above in the presence of 0.50 g of graphite.

jfraser · Answer

You know how many moles of CO2 you start with, and you know what the equilibrium constant will be, so plug into an ICE box and find the pressures of each component at equilibrium (ignore the solid)