How much heat is absorbed when 45.00 g of C(s) reacts in the presence of excess SO₂(g) to produce CS₂(l) and CO(g) according to the following chemical equation?
5 C(s) + 2 SO₂(g) → CS₂(l) + 4 CO(g) ΔH° = 239.9 kJ

Question

Quizplus · Accepted Answer

The reaction involves 5 moles of C, and the given ΔH° is for the reaction as written. The molar mass of C is 12.01 g/mol, so 45.00 g of C is 45.00/12.01 = 3.747 moles. The heat absorbed is proportional to the moles of C reacting, so (3.747/5) * 239.9 kJ = 179.8 kJ.

How Much Heat Is Absorbed When 45