Chemistry

Chemistry

Problem

Four fuels combust according to the equations below (coefficients represent one mole of reaction as written). The molar enthalpy change and molar mass for each fuel are provided. A. Fuel A: ΔH=−600 kJ mol−1\Delta H = -600\,\text{kJ mol}^{-1}, M=180 g mol−1M = 180\,\text{g mol}^{-1} B. Fuel B: ΔH=−890 kJ mol−1\Delta H = -890\,\text{kJ mol}^{-1}, M=44 g mol−1M = 44\,\text{g mol}^{-1} C. Fuel C: ΔH=−285 kJ mol−1\Delta H = -285\,\text{kJ mol}^{-1}, M=18 g mol−1M = 18\,\text{g mol}^{-1} D. Fuel D: ΔH=−1360 kJ mol−1\Delta H = -1360\,\text{kJ mol}^{-1}, M=256 g mol−1M = 256\,\text{g mol}^{-1} When equal masses of each fuel are completely combusted, which fuel releases the greatest amount of energy per gram of fuel consumed? a) Fuel D b) Fuel B c) Fuel C d) Fuel A

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