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

Quizplus · Accepted Answer

The molar mass of Ba is 137.33 g/mol. The reaction involves 2 moles of Ba, releasing 1107 kJ. For 5.75 g of Ba, calculate moles: 5.75 g / 137.33 g/mol = 0.0419 mol. Since 2 moles release 1107 kJ, 0.0419 moles release (1107 kJ / 2) * 0.0419 = 23.2 kJ.

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