How much heat is released when 29.5 grams of Cl₂ (g) reacts with excess hydrogen?
H₂ (g) + Cl₂ (g) → 2HCl (g) ΔH° = -186 kJ.

Question

How much heat is released when 29.5 grams of Cl₂ (g)reacts with excess hydrogen? H₂ (g)+ Cl₂ (g)→ 2HCl (g)ΔH° = -186 kJ. A)186 kJ B)310 kJ C)-77.4 kJ D)-186 kJ E)77.4 kJ

Quizplus · Accepted Answer

The molar mass of Cl₂ is approximately 70.9 g/mol. 29.5 g of Cl₂ is 29.5/70.9 = 0.416 mol. The reaction releases 186 kJ per mole of Cl₂, so 0.416 mol releases 0.416 * 186 = 77.4 kJ.

How Much Heat Is Released When 29