February 27, 2017

Homework Help: Chemistry

Posted by Ryan on Wednesday, October 8, 2008 at 11:45pm.

Steam at 100°C was passed into a flask containing 250 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 76°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).

I use the formula
q=m*specific heat*delta T
250*4.18*(76-21) = 57.475KJ
Hvap/g H20
40.7/18 = 2.26KJ/g
57.475KJ/2.26KJ/g = 25.4g (answer)

It keeps telling me the answer is wrong. Can you please tell me what I may be doing wrong in this problem?

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