Q.

The amount of heat evolved on combustion of 10 grams of benzoic acid is 10 K.Cals. The heat of combustion of benzoic acid is   

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a

–122 K.Cals

b

–92 K.Cals     

c

–132 K.Cals

d

–112 K.Cals

answer is A.

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Detailed Solution

The amount of heat evolved on combustion of 10 grams of benzoic acid = 10K.cal.

The molecular weight of benzoic acid is 122.

 The amount of 1 mole of combustion of benzoic acid is =12210×10=122 .

Hence the correct answer is (A).

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