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 Ba (s) reacts completely with oxygen to form
BaO (s) ?

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 Ba (s)reacts completely with oxygen to form BaO (s)?

Quizplus · Accepted Answer

The molar mass of Ba is 137.33 g/mol. For 5.75 g of Ba, moles = 5.75 g / 137.33 g/mol = 0.0419 mol. Since the reaction releases -1107 kJ for 2 moles of Ba, for 0.0419 mol, the heat released is (0.0419 mol / 2 mol) * -1107 kJ = -23.2 kJ.

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