When octane,C₈H₁₈,reacts with oxygen to produce carbon dioxide and water,5070 kJ of heat are released per mole of methane.How many kJ of heat are released per gram of oxygen used?

Question

Quizplus · Accepted Answer

The balanced reaction for octane combustion is 2C8H18 + 25O2 → 16CO2 + 18H2O. The molar mass of O2 is 32 g/mol. For 5070 kJ released per mole of octane, the heat released per gram of O2 is (5070 kJ/25 moles of O2) / 32 g/mol = 12.7 kJ/g.

When Octane,C8H18,reacts with Oxygen to Produce Carbon Dioxide and Water,5070

When Octane,C₈H₁₈,reacts with Oxygen to Produce Carbon Dioxide and Water,5070