[alexsinkov]

The heat of vaporization of water is 540 cal/g. If you apply 45.0 kcal to 100.0g of water, what volume of water vaporizes?


I came up with couple of answers just wanted to make sure I did it right  please show work.

[Yggdrasil]

What answer did you get?

[alexsinkov]

I was thinking :

1g --540cal

so

100g -- 54000cal

xg    --4500cal

then 4500x100 /54000 =8.3

what do u think

[Yggdrasil]

It asks about 45 kcal = 45000 cal.  You have the answer for 4.5kcal = 4500 cal.

Also, this answer assumes that the 100g of water are at 100^oC already.  Note that your answer doesn't need to be as complicated (the 100g part doesn't matter).  All you need to do is divide 45000cal by 540 cal/g (which is basically the same thing you did but less work).