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Octane, C8H18, a primary constituent of gasoline, burns in air: C8H18(ℓ) + 12 1/2 O2(g) → 8 CO2(g)...

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Chemistry

Octane, C8H18, a primary constituent ofgasoline, burns in air:

C8H18(ℓ) + 12 1/2 O2(g) → 8CO2(g) + 9 H2O(ℓ)

A 1.00-g sample of octane is burned in a constant volumecalorimeter. The calorimeter is in an insulated container with1.20 kg of water. The temperature of the water andthe bomb rises from 25.00 °C (298.15 K) to 33.21°C (306.36 K). The heat required to raise thebomb’s temperature (its heat capacity), Cbomb, is 837J/K. The specific heat of water is 4.184 J/g∙K. What is the heat ofcombustion per gram of octane? What is the heat of combustion permole of octane?

kJ/g

kJ/mol

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