Steam at 100oC is passed into 1.1 kg of water contained in a calorimeter of wate

Question

Steam at

100^{o} C

is passed into 1.1 kg of water contained in a calorimeter of water equivalent 0.02 kg at

15^{o} C

till the temperature of the calorimeter and its contents rises to

80^{o} C .

The mass of the steam condensed in kg is
(IIT JEE 1986)

Options:

A . 0.130

B . 0.065

C . 0.260

D . 0.135

Answer: Option D
:
D
Heat required

Q = (1.1 + 0.02) \times 10^{3} \times 1 \times (80 - 15) = 72800 c a l .

Therefore, mass of steam condensed (in kg)

m = \frac{Q}{L} = \frac{72800}{540} \times 10^{- 3} = 0.135 k g .

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