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Steam at 100.°C was passed into a flask containing 360.0 g of water at 21°C where...

Steam at 100.°C was passed into a flask containing 360.0 g of water at 21°C where the steam condensed. How many grams of steam must have condensed if the temperature of the water in the flask was raised to 78°C? The heat of vaporization of water at 100.°C is 40.7 kJ/mol, and the specific heat is 4.18 J/(g·°C).

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