When Baking Soda Is Heated It Decomposes According to the Following

Multiple Choice

When baking soda is heated it decomposes according to the following reaction: 2 NaHCO₃(s) ⇌ Na₂CO₃(s) + H₂O(g) + CO₂(g)
If sufficient baking soda is placed in a container and heated to 90°C,the total pressure of the gases is 0.5451 atm.What is the value of K_p at that temperature?

A) 0.07428
B) 0.2973
C) 0.4228
D) 1.091