Q.

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

Moderate

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a

0.130

b

0.065

c

0.260

d

0.135

answer is 1.

(Detailed Solution Below)

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Detailed Solution

Heat is lost by steam in two stages: (i) for change of state from steam at 100oC to water at 100oC is m x 540(ii) to change water at 100oC to water at 80oC is m × 1 × (100 - 80), where m is the mass of steam condensed.Total heat lost by steam is m × 540 + m × 20 = 560m (cals) Heatgained by calorimeter and its contents is=(1.1+0.02)×(80−15)=1.12×65 cals using Principle of calorimetery, Heat gained = heat lost∴560m=1.12×65 ⇒m=0.130gm
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