October 28, 2016

Homework Help: Chemistry

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

Steam at 100C was passed into a flask containing 250 g of water at 21C, where the steam condensed. How many grams of steam must have condensed if the temperature of the water in the flask was raised to 76C? The heat of vaporization of water at 100C is 40.7 kJ/mol and the specific heat is 4.18 J/(gC).

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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