The aromatic hydrocarbon cymene (C10H14) is found in nearly100 spices and fragra

Question

The aromatic hydrocarbon cymene (C10H14) is found in nearly100 spices and fragrancs including coriander, anise, andthyme. The complete combusion of 1.608 g of cymene in a bombcalorimeter (Ccalorimeter = 3.640 kJ/degree C) produced an increasein temperature of 19.35 degree C. Calculate the molarenthalpy of combusion of cymene (Hcomb) in kilojoules permole of cymene. ________ kJ/mol The aromatic hydrocarbon cymene (C10H14) is found in nearly100 spices and fragrancs including coriander, anise, andthyme. The complete combusion of 1.608 g of cymene in a bombcalorimeter (Ccalorimeter = 3.640 kJ/degree C) produced an increasein temperature of 19.35 degree C. Calculate the molarenthalpy of combusion of cymene (Hcomb) in kilojoules permole of cymene. ________ kJ/mol

Explanation / Answer

first of all you need to find the amount of moles of cymenethat you have. 10*12.011+14*1.00794=134.22116 g/mol 1.608g/134.22116 g/mol=.01198 mol. Now find the amount of energy release into the calorimeterassuming adiabetic conditions. T=19.35 3.640 kJ/degreeC * 19.35 degree C=70.434 kJ. Now just divide the two. 70.434/.01198=5879.3 kJ/mol Which is your final answer.

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