100 G of Liquid Nitrogen at Its Boiling Point of 77

question 31

Multiple Choice

100 g of liquid nitrogen at its boiling point of 77 K is stirred into a beaker containing 600 g of 15°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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