AAMC PRACTICE EXAM 3 2024/2025 WITH 100% CORRECT ANSWERS WITH RATIONALES

AAMC PRACTICE EXAM 3 2024/2025 WITH 100% CORRECT ANSWERS WITH RATIONALES Limestone does NOT decompose when heated to 900 K because, at 900 K, ΔH is: *The chemist placed a sample of limestone, CaCO3(s), into a sealed chamber and then heated the limestone to 1200 K to generate CO2(g) and CaO(s). A. positive and less than TΔS. B. positive and greater than TΔS. C. negative and less than TΔS. D. negative and greater than TΔS. - correct answer A. positive and less than TΔS. think about it, if H is positive and less than TS than G is positive and the reaction is non spontaneous. that is why it won't decompose at 900K, need more heat When limestone is heated during Step 1, an equilibrium is established. Which of the following expressions is the equilibrium constant for the decomposition of limestone? **The chemist placed a sample of limestone, CaCO3(s), into a sealed chamber and then heated the limestone to 1200 K to generate CO2(g) and CaO(s).