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Topic: solving for heat elementary chemistry  (Read 11422 times)

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Offline sasha11

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solving for heat elementary chemistry
« on: September 16, 2012, 10:37:37 PM »
When 47.5 J of heat are added to 13.2 g of a liquid, its temperature raises by 1.72 degree Celsius. What is the heat capacity of the liquid?

Q=m·c·Δt
47.5 joules = 13.2g·4.18Joules·1.72°c
47.5 = 94.90272g

Do I divide this I'm not sure if this is right?Can someone point me in the right direction?

Thanks

Offline UG

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Re: solving for heat elementary chemistry
« Reply #1 on: September 16, 2012, 10:45:44 PM »
What does the c stand for in your equation?

Offline sasha11

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Re: solving for heat elementary chemistry
« Reply #2 on: September 16, 2012, 10:55:53 PM »
c stands for specific heat

Offline UG

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Re: solving for heat elementary chemistry
« Reply #3 on: September 16, 2012, 11:19:15 PM »
Yes that is true, but another name for specific heat is the specific heat capacity which is what you want to find. The unknown is c, you need to rearrange your equation to isolate c and then solve using the information given.

Offline sasha11

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Re: solving for heat elementary chemistry
« Reply #4 on: September 16, 2012, 11:35:57 PM »
C=[47.5joules]/[13.2grams·1.72°c]

C= 2.09 j/gc

with scientific digits
I think it will be
C=2.10 j/gc
If I'm wrong tell me where please
Thanx

Offline UG

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Re: solving for heat elementary chemistry
« Reply #5 on: September 16, 2012, 11:43:03 PM »
If the answer comes out as 2.09 then leave as is since all other values are known to three significant figures

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