How much energy is released if 3705g of octane are burned

Question

Chemistry

Tess Holmes

4 October, 17:59

How much energy is released if 3705g of octane are burned

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Answers (1)

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Amara Valenzuela · Answer 1

Chemical reaction: C₈H₁₈ + 25/2O₂ → 8CO₂ + 9H₂O; ΔH = - 5500 kJ/mol.

m (C₈H₁₈) = 3705 g.

n (C₈H₁₈) = m (C₈H₁₈) : M (C₈H₁₈).

n (C₈H₁₈) = 3705 g : 114 g/mol.

n (C₈H₁₈) = 32,5 mol.

Make proportion: 1 mol (C₈H₁₈) : 5500 kJ = 32,5 mol : Q.

Q = 178750 J : 1000 J/kJ = 178,75 kJ of energy is released when octane is burned.