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# Can you help me with this heat problem?

What is the energy change for 250 g sample of liquid water at 20 C that is converted to water vapor at 140 C?

I am not sure if I got the right answer. I got 1.6 x 10^5 cal, but not sure if it's correct. What did you get?

### 1 Answer

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- ColinLv 78 years agoFavourite answer
As you didn't post the data you used, here is how to do it. You just add the three stages

A. To heat water to 100C = 250 x 4.18 x (100 - 20) J

B) to vaporise water = 250 x heat of vaporisation J

C) to heat steam at 100 to 140C = 250 x heat capacity of steam x (140 -100) J

Source(s): Rtc

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