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Posted by on Friday, December 31, 2010 at 12:02pm.

when 84 joules of heat are added to 2.0 grams of water at 15 degrees C, what will be the final temperature of the water?

A. 50. degrees C
B. 5.0 degrees C
C. 25 degrees C
D. 15 degrees C

  • chemistry - , Friday, December 31, 2010 at 1:16pm

    Let's see if you can do that in your head, knowing that 4.18 joules is 1 calorie. (a good number to remember)
    80 joules is therefore very close to 20 calories.
    Since the specific heat of water is 1.0 calories per degree-gram, 20 calories is enough to heat 2 grams 10 degrees C.
    If you start at 15 C, and add 10, what do you end up with for the temperature?

  • chemistry - , Wednesday, October 19, 2016 at 10:31pm


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