How many kilojoules of energy are released when 90.0 grams of water are produced in the reaction shown below?
2 H₂(g) + O₂(g) → 2 H₂O(l) ΔH° = -572 kJ

Question

How many kilojoules of energy are released when 90.0 grams of water are produced in the reaction shown below? 2 H₂(g)+ O₂(g)→ 2 H₂O(l)ΔH° = -572 kJ A)5720 kJ B)2860 kJ C)1430 kJ D)715 kJ

Quizplus · Accepted Answer

The reaction produces 2 moles of water with ΔH° = -572 kJ. The molar mass of water is 18 g/mol, so 90 g of water is 5 moles. Therefore, the energy released is (5/2) * 572 kJ = 1430 kJ.

How Many Kilojoules of Energy Are Released When 90