How much heat is released if 35.0 g of ethanol (C₂H₅OH) burns in excess oxygen? C₂H₅OH(l) + 3O₂(g) → 2CO₂(g) + 3H₂O(l) ΔH°_rxn = -1367 kJ/mol

Question

Quizplus · Accepted Answer

The heat released when ethanol burns can be calculated using the given ΔH°rxn and the molar mass of ethanol (C2H5OH). First, find the moles of ethanol: 35.0 g / 46.07 g/mol (molar mass of ethanol) = 0.759 moles. Then, use the given ΔH°rxn: 0.759 moles × (-1367 kJ/mol) = -1038.493 kJ, which rounds to -1040 kJ, indicating that 1040 kJ of heat is released.

How Much Heat Is Released If 35