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
Text Solution
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Heat is lost by steam in two stages
(i) for change of state from steam at 100ºC to water at 100ºC is m × 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 = 560 m (cals) Heat gained by calorimeter and its contents is
= (1.1 + 0.02) × (80 – 15) = 1.12 × 65 cals.
using Principle of calorimeter, Heat gained = heat lost
∴ ∴ 560 m = 1.12 × 65, m = 0.130 gm
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