Question

question 14 of 25 how does the entropy change in the reaction 2c3h6(g) + 9o2(g) → 6co2(g) + 6h2o(g)? a. the entropy is constant. b. the entropy decreases. c. the entropy increases. d. it is impossible to tell.

Explanation:

Step1: Count moles of reactants

Reactants: 2 moles of $C_3H_6$ and 9 moles of $O_2$, total 2 + 9 = 11 moles of gas.

Step2: Count moles of products

Products: 6 moles of $CO_2$ and 6 moles of $H_2O$, total 6+6 = 12 moles of gas.

Step3: Analyze entropy change

Entropy is related to the number of micro - states and more moles of gas usually mean higher entropy. Since the number of moles of gas increases from reactants to products, entropy increases.

Answer:

C. The entropy increases.