Question

The molar enthalpy of combustion of benzene is -3264. 6kJ/mol. Calculate the amount of heat energy liberated when 39g of benzene is burnt in excess of air. Given molar mass of benzene is 78 g/mol

Answer 1

Answer ⇒  1632.3 kJ.

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Explanation ⇒

∴ 1 mole of the Benzene produce -3264. 6 kJ of Energy.

∴ 78 g of the Benzene produce -3264. 6 kJ of Energy.

∴ 1 g of the Benzene produce -3264. 6 kJ/78 of Energy.

∴ 39 g of the Benzene produce -3264. 6 kJ/78 × 39 of Energy.

  = -3264.6/2 kJ = 1632.3 kJ.

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