The value of ΔH° for the reaction below is -1107 kJ: 2Ba (s) + O₂ (g) → 2BaO (s)
How many kJ of heat are released when 5.75 g of BaO (s) is produced?

Question

The value of ΔH° for the reaction below is -1107 kJ: 2Ba (s)+ O₂ (g)→ 2BaO (s) How many kJ of heat are released when 5.75 g of BaO (s)is produced?

Quizplus · Accepted Answer

The molar mass of BaO is approximately 153.3 g/mol. Therefore, 5.75 g of BaO is 5.75/153.3 = 0.0375 mol. Since the reaction produces 2 moles of BaO with ΔH° = -1107 kJ, the heat released for 0.0375 mol is (1107/2) * 0.0375 = 20.8 kJ.

The Value of ΔH° for the Reaction Below Is -1107