Problem: The heat of combustion of liquid octane (C8H18) to carbon dioxide and liquid water at 298 K is -1303 kJ/mol. Find ΔE for this reaction.

FREE Expert Solution

The change in enthalpy ΔH and change in internal energy ΔE is related by the following equation:

From the ideal gas law, we have:

Plugging this into the first equation:

where ngas = moles of gas in the reaction, R = universal gas constant, T = temperature. At a given temperature:

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Problem Details

The heat of combustion of liquid octane (C8H18) to carbon dioxide and liquid water at 298 K is -1303 kJ/mol. Find ΔE for this reaction.

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