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Chapter 8 Number 19

Posted: Sun Jan 15, 2017 5:12 pm
by Vanessa Romero-Campos 2B
a)calculate the heat that must be supplied to a 500.0 g copper kettle containing 400.0 g of water to raise its temperature from 22.0 degrees Celsius to 100degrees celsius.

I used the equation q=(m)*(Cs)*(delta T) and plugged in the given information as follows:

(400g)*(4.184 J/C*g)*(100-22) and got 13040.8, however, on the solution manual there is a second part that is added to the part I already have.

Why is it that the second part ((500g)*(0.38 J/C*g)*(100-22)) is added to the first?

The solution manual has the following solution:
(400g)*(4.184 J/C*g)*(100-22)+(500g)*(0.38 J/C*g)*(100-22)

Re: Chapter 8 Number 19

Posted: Sun Jan 15, 2017 5:20 pm
by Gisselle Cervantes 2G
What you calculated was only the first part that raises the temperature of the copper, so the second part was added to take into account the heat needed to raise the temperature of the water. When calculating heat change, you need to take into account both the metal and water.

Re: Chapter 8 Number 19

Posted: Sun Jan 15, 2017 5:22 pm
by Vanessa Romero-Campos 2B
Ohh okay, Thank you :)