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Chemistry - Specific Heat w/ Silver?
I'm a little confused with my lab. I know the specific heat of silver at 20 C is about .240 J/gC
However, in my lab I got 0.1... here's what the situation is:
You have 5g of silver. The starting temperature is 20 C, and then you heat the silver for 3 seconds and the temperature changes to 551.9 C. This is a 531.9 C change in temperature. The amount of energy absorbed was 250 Joules.
Next, using c = Q/mT I did:
c = 150 J / 5g * 531.9 C
c = 0.0564 J/gC
Did I do something wrong? Is it because of the certain amount of silver used? I'm not sure.
1 Answer
- ?Lv 77 years ago
Hello Jake : You have :
------------------------------------
Q = ( m ) Cp ) ( T2 - T1 )
Cp = ( Q ) / ( m ) ( T2 - T1 )
Cp = ( 250 J ) / ( 5.1 g ) ( 551.9 C - 20 C )
Cp = 0.0922 J / g - C deg <------------------------
Correct value for silver Cp is 0.235 J / g - C deg .
( 1 ) You should have used 250 J for Q in your calculation.
( 2 ) Why did to do the heating for just 3 seconds ?
( 3 ) How did you get Q ?
( 4 ) You should consider re-performing your experiment.