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Question

Steam at 100oC is passed into 1.1 kg of water contained in a calorimeter of water equivalent 0.02 kg at 15oC till the temperature of the calorimeter and its contents rises to 80oC. The mass of the steam condensed in kg is

Specific heat of water = 1 kcal/kgC, Latent heat of Vaporisation = 540 kcal/kg


A

0.130

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B

0.065

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C

0.260

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D

0.135

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Solution

The correct option is D

0.135


Heat required Q=(1.1+0.02) × 103 × 1 × (8015)=72800 cal.
Therefore, mass of steam condensed (in kg)
m=QL=72800540 × 103=0.135kg.


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