Calcium Carbonate Decomposes at High Temperatures to Give Calcium Oxide $\circ$

Calcium carbonate decomposes at high temperatures to give calcium oxide and carbon dioxide as shown below.CaCO₃(s) ⇌ CaO(s) + CO₂(g) The K_P for this reaction is 1.16 at 800 ^$\circ$ C. A 5.00 L vessel containing 10.0 g of CaCO₃(s) was evacuated to remove the air, sealed, and then heated to 800 ^$\circ$ C. Ignoring the volume occupied by the solid, what will be the overall mass percent of carbon in the solid once equilibrium is reached

A) 5.36% carbon by mass
B) 5.56% carbon by mass
C) 5.76% carbon by mass
D) 5.96% carbon by mass
E) None of the above