I got the first part, but can\'t figure out why the last part is wrong. Help, pl

Question

I got the first part, but can't figure out why the last part is wrong. Help, please! At atmospheric pressure (1.013 105 Pa) and 15.0°C, 4.50 g of water occupies a volume of 4.50 cm3. (a) Find the change in internal energy when the water is heated to the boiling point. 1 J When the water is boiled, it becomes 7519 cm3 of steam. Assume the steam vapor doesn't mix with the surrounding air and that it expands at atmospheric pressure. (b) Calculate the change in the internal energy for this process. 2 Your answer is within 10% of the correct value. This may be due to roundoff error, or you could have a mistake in your calculation. Carry out all intermediate results to at least four-digit accuracy to minimize roundoff error. J

Explanation / Answer

The reason that you are getting the secodn one wrong is thatthere is a difference in energy between water at biolingtemperature and steam at the same temperature. This is calledthe Latent Heat of Vaporization. so in order to get the rightanswer you need to add this number. For more on how to solvethis and to see the Latent Heat of Vaporization of severaldifferent presurres see this website. http://www.engineeringtoolbox.com/saturated-steam-properties-d_457.html

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