100 G of Liquid Nitrogen at Its Boiling Point of 77

question 69

Multiple Choice

100 g of liquid nitrogen at its boiling point of 77 K is stirred into a beaker containing 500 g of 15 $\degree$ C water.If the nitrogen leaves the solution as soon as it turns to gas,how much water freezes? The heat of vaporization of nitrogen is 48 cal/g and that of water is 80 cal/g.

• A)none
• B)29 g
• C)68 g
• D)109 g

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