A) 0.130
B) 0.065
C) 0.260
D) 0.135
Correct Answer: A
Solution :
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 calorimetery, Heat gained = heat lost \ 560 m = 1.12 × 65, m = 0.130 gm
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