Problem: A sample of a hydrocarbon is combusted completely in O2(g) to produce 24.01 g CO2(g), 4.917 g H2O(g), and 342 kJ of heat.Calculate the value of ΔHf per empirical-formula unit of the hydrocarbon.

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Calculate the moles of C and moles of H:

mol C = 24.01 g CO2 1 mol CO244.02 g CO21 mol C1 mol CO2mol C =0.55 mol Cmol H = 4.917 g H2O 1 mol H2O18 g H2O2 mol H1 mol H2Omol H = 0.55 mol H

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Problem Details

A sample of a hydrocarbon is combusted completely in O2(g) to produce 24.01 g CO2(g), 4.917 g H2O(g), and 342 kJ of heat.

Calculate the value of ΔHf per empirical-formula unit of the hydrocarbon.

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