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?

Question

Quizplus · Accepted Answer

The correct answer is A.The equilibrium constant, Kp, is given by the expression:Kp = (P(CO2) * P(H2O)) / P(NaHCO3)^2At 90°C, the total pressure of the gases is 0.5451 atm. Since the reaction produces equal moles of CO2 and H2O, the partial pressure of each gas is 0.5451 atm / 2 = 0.27255 atm.The partial pressure of NaHCO3 is not given, but it can be assumed to be negligible compared to the partial pressures of the gases. Therefore, we can approximate Kp as:Kp ≈ (0.27255 atm * 0.27255 atm) / (1 atm)^2 = 0.07428Therefore, the value of Kp at 90°C is approximately 0.07428.

When Baking Soda Is Heated It Decomposes According to the Following