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Q.

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

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a

0.37

b

307

c

37

d

370

answer is D.

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Detailed Solution

Q=msH2OΔT=200×1×5 =1000cal0.2 g of butanol ----------------- 1000 cal                   74g of butanol ------------------ ?74×10000.2=370×103cal/mol=370k.cal/mol∣
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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