Aromatic spice The aromatichydrocarbon cymene (C10H14) is found in nearly 100 sp

Question

Aromatic spice     The aromatichydrocarbon cymene (C10H14) is found in nearly 100 spices andfragrances including coriander, anise, and thyme. Thecomplete combusion of 1.608 g of cmene in a bomb calorimeter(Ccalorimeter = 3.640 kJ/degree C) produced an increase intemperature of 19.35 degree C. Calculate the molar enthalpyof combustion of cymene (Hcomb) in kilojoules per mole ofcymene. ________ kJ/mol Aromatic spice     The aromatichydrocarbon cymene (C10H14) is found in nearly 100 spices andfragrances including coriander, anise, and thyme. Thecomplete combusion of 1.608 g of cmene in a bomb calorimeter(Ccalorimeter = 3.640 kJ/degree C) produced an increase intemperature of 19.35 degree C. Calculate the molar enthalpyof combustion of cymene (Hcomb) in kilojoules per mole ofcymene. ________ kJ/mol

Explanation / Answer

Heat of combustion = C * T * M / W Where C = heat capacity = 3.640 KJ / o C          T = raise in temperature = 19.35 o C            W= weight of the substance = 1.608 g           M =Molar mass of cymene , C10H14 = 10 * 12 + 14 * 1= 134 g Plug the values we get Heat of combustion = 21364.98 KJ / mol     So,. molar enthalpy ofcombustion =  21364.98 / M                                                           =159.44 KJ / mol

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