One mole of methanol, when burnt in oxygen, gives out 723 kJ m o l - 1 heat. If one mole of oxygen is used, what will be the amount of heat evolved?

Question

One mole of methanol, when burnt in oxygen, gives out 723 kJ m o l - 1 heat. If one mole of oxygen is used, what will be the amount of heat evolved?, 723 kJ, 964 kJ, 482 kJ, 241 kJ

MARKS App · Accepted Answer

2 C H 3 O H 2 m o l + 3 O 2 3 m o l → 2 C O 2 + 4 H 2 O Δ H = - 723 k J / m o l 1 mol O 2 ≡ 2 3 m o l C H 3 O H 1 mol C H 3 O H on combustion gives out 723 kJ heat So 2 3 m o l C H 3 O H combustion gives out = 723 × 2 3 kJ heat = 482 kJ heat.

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