Question

During volcanic eruptions, hydrogen sulfide gas is given off and oxidized by air according to the following chemical equation: 

2H₂S(g) + 3O₂(g) →2SO₂(g) + 2H₂O(g) 

Calculate the standard enthalpy change for the above reaction given:

3S(s) + 2H₂O(g) → 2H₂S(g) + SO₂(g) ΔH° = 146.9 kJ/mol

S(s) + O₂(g) → SO₂(g) ΔH° = –296.4 kJ/mol

(A) –1036.1 kJ/mol

(B) –742.3 kJ/mol

(C) –149.5 kJ/mol

(D) 443.3 kJ/mol

(E) 742.3 kJ/mol

Answer 1

(A) –1036.1 kJ/mol