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Question
How much steam at 100oC must be passed into 120 g of water at 20oC to raise the temperature to 40oC?
Solution
Let the mass of steam be m.
Heat lost by (steam at 100°C to oondense into water at 100°C + 100°C water to oonvert into 40°C wa:er =Heat gained by water to raise the temperature to 40°C
m x 2268 + m x 4.2 x (100 - 40) = 120 x 4.2 x ( 40 - 20)
m (2268 + 252) = 10080
m = 4g
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