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

Question

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

TestHub · Accepted Answer

Use grams and calories.
Water and calorimeter effective mass:
$M = 1100 + 20 = 1120 g$
$Δ T = 80 - 15 = 65^{\circ} C$
$Q = 1120 (65)$
$Q = 72800 cal$
Each gram of steam releases:
$q = 540 + (100 - 80)$
$q = 560 cal/g$
$560 m = 72800$
$m = 130 g$
$m = 0.130 kg$

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