When 0.2g of butanol was burnt in a suitable apparatus, the heat evolved was sufficient to raise the temperature of 200g of water by 5K. The heat of combustion of butanol in K.cal/mol is 

When 0.2g of butanol was burnt in a suitable apparatus, the heat evolved was sufficient to raise the temperature of 200g of water by 5K. The heat of combustion of butanol in K.cal/mol is 

  1. A

    0.37

  2. B

    307

  3. C

    37

  4. D

    370

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    Solution:

    Q=msH2OΔT=200×1×5 =1000cal

    0.2 g of butanol ----------------- 1000 cal

                       74g of butanol ------------------ ?

    74×10000.2=370×103cal/mol=370k.cal/mol

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