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Topic: Final temperature of water after ice is dropped in  (Read 4664 times)

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Offline Jegland

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Final temperature of water after ice is dropped in
« on: October 09, 2009, 05:12:13 PM »
Heres the problem:

What is the final temperature after a 27.2 g piece of ice is placed into a styrofoam cup containing 124 g of hot water at 73.5oC?

Heres my method:

27.2 g * 333 J/g = 9057.6 J

then...

124 g * 4.184 J/Kg * (x - 73.5) = -9057.6 J

solving for x gives...56.0oC...yet the online homework program i use lists it as wrong...??

*delete me*! please! They say the answer is 46.0oC


Offline plankk

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Re: Final temperature of water after ice is dropped in
« Reply #1 on: October 09, 2009, 05:27:42 PM »
An amount of water which will be released from a piece of ice must be heated.

Look also that the unit for specific heat is Joule per gram and Kelvin (not the degree Celsius).

Offline Jegland

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Re: Final temperature of water after ice is dropped in
« Reply #2 on: October 09, 2009, 05:34:16 PM »
alright, i figured it out!

i added this to my equation...

27.2 g * 4.184 * (x - 0)

to account for the water coming from the ice, and i got 46 degrees C!

Thanks for the *delete me*

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