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Benzoic acid, 1.40 g , is reacted with oxygen in a constant volume calorimeter to form...

Benzoic acid, 1.40 g , is reacted with oxygen in a constant volume calorimeter to form H2O(l) and CO2(g) at 298 K. The mass of the water in the inner bath is 1.45×103 g . The temperature of the calorimeter and its contents rises 2.85 K as a result of this reaction.

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Answer #1

Heat evolved (Q) = m s . delta T

                   Where, m = mass of water; s = specific heat of water = 1 Cal/gK

             Q = 1.45 x 103 x 1 x 2.85 = 4132.5 Cal.

Number of moles of bezoic acid = mass/molar mass = 1.40/122.12 = 0.011464 mol

Heat of combustion of benzoic acid = Q/number of moles = 4132.5 /0.011464 = 360.48 kCal/mol

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