Complete combustion of each fuel proceeds as written: C H (g) + 5 O (g) → 3 CO (g) +…

CHEMISTRY · Subjective · A Level · Chemistry · Energetics · Energetics

Problem

Complete combustion of each fuel proceeds as written: C3_3H8_8(g) + 5 O2_2(g) → 3 CO2_2(g) + 4 H2_2O(l) C2_2H5_5OH(l) + 3 O2_2(g) → 2 CO2_2(g) + 3 H2_2O(l) Standard enthalpies of formation (kJ mol−1^{-1}): C3_3H8_8(g) = –105, C2_2H5_5OH(l) = –277, CO2_2(g) = –394, H2_2O(l) = –286, O2_2(g) = 0. Molar masses: C3_3H8_8 = 44.1 g mol−1^{-1}, C2_2H5_5OH = 46.1 g mol−1^{-1}. Determine the enthalpy change per gram of each fuel for complete combustion at 298 K and identify which fuel releases more energy per gram.

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