Q: Steam at 100 °C is allowed to pass into a vessel containing 10 g of ice and 100 g of water at 0 °C, until all the ice is melted and the temperature is raised to 40 °C. Neglecting water equivalent of the vessel and the loss due to radiation etc. the approximate amount of steam condensed is
(a) 9 g
(b) 18 g
(c) 15 g
(d) 21 g
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Ans: (a)
Sol: m Ls + m sw (100-40) = mice Lice + (mice + mw ) sw (40-0)
m × 540 + m × 1 × 60 = 10 × 90 + (10+100) × 1 × 40
600 m = 800 + 4400
m ≃ 9 g