10 g of ice at 0∘C is mixed with 5g of steam at 1000∘C. If latent heat of fusion of ice is 80 cal/g and latent heat of vaporization of 540 cal/g. Then at thermal equilibrium
A
Temperature of the mixture is 0∘C
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B
Temperature of mixture is 100∘C
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C
Mixture contains 13.3g of water and 1.67 g of steam
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D
Mixture contains 5.3g of ice and 9.7g of water
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Solution
The correct options are B Temperature of mixture is 100∘C CMixture contains 13.3g of water and 1.67 g of steam Heat gain by ice to melt =mLf=10×80=800 cal Heat gain by 10 g water to raise its temperature from 0∘C to 100∘C=10×1×100=1000cal Mass of steam converted into water ∴1800=m×540⇒m=3.33g ⇒ Equilibrium temperature 100∘C Amount of water 10 + 3.33 = 13.33 g Amount of steam = 5 – 3.33 = 1.67 g