Answer to Question #210481 in Chemistry for sara

Question

Which of the following reactions is accompanied by an increase in enthalpy? 

1. 2NO(g) + O2(g) → 2NO2(g) + 113 kJ

1. 2H2(g) + O2(g) - 484 kJ ⇌ 2H2O(g)

1. 2SO3(g) ⇌ 2SO2(g) + O2(g)  ∆H = +197 kJ

1. 4HCl(g) + O2(g) ⇌ 2H2O(g) + 2Cl2(g)  ∆H = -111.4 kJ

Answer 1

2SO3(g) ⇌ 2SO2(g) + O2(g) ∆H = +197 kJ