Question

1. For each reaction, indicate whether the sign of ΔS for the system will be positive or negative. a) C6H6 (g, 500°C) → C6H6 (g, 400°C)

b) C2H6 (g) + 7/2 O2 (g) → 2 CO2 (g) + 3 H2O (l)

c) CO2 (s) → CO2 (g)

d) 1 mol H2 (g) in a 1 L container → 1 mol H2 (g) in a 2 L container (constant temperature)

Answer 1

 a) C6H6 (g, 500°C) → C6H6 (g, 400°C) negative

b) C2H6 (g) + 7/2 O2 (g) → 2 CO2 (g) + 3 H2O (l) negative

c) CO2 (s) → CO2 (g) negative

d) 1 mol H2 (g) in a 1 L container → 1 mol H2 (g) in a 2 L container (constant temperature) positive