Answer to Question #139787 in General Chemistry for Hodan

Question

Identify the ΔHf for each product and reactant and solve using the equation:
Example: Determine ΔH for the following reaction:
CS2 (g) + 3O2 ---------- 2 SO2 (g) + 2 H2O (g)

Answer 1

CS₂ (g) + 3O₂ (g) = 2SO₂ (g) + CO₂ (g)

Data:

CS₂ (g): 117.1 kJ/mol

3O₂ (g): 0

Reactants total: 117.1 kJ/mol

2SO₂ (g): 2x(−296.1) kJ/mol

CO₂ (g): −393.5 kJ/mol

Products total: 2x(−296.1) + (−393.5) = -985.7 kJ/mol

Produsts - reactants = -985.7 - 117.1 = -1102.8 kJ/mol