Posted by Sam on .
calories given off when 85g of water cools from 48C to 23C.
Express your answer using two significant figures.
I know the answer is 2100 cal, but I just need to know why the answer is a positive value instead of negative, when it is supposed to be cooling down.
Cooling water means the heat is given off and heat emitted is negative, always. Look at it the other way. If heat were absorbed, it would be positive and the temperature of the water would increase. Right?
I have another question about this problem. I know that dT is (T(final)-T(initial)).
is the T(final)=23C or is it 48C?
since it's from "48C to 23C", shouldn't the final be 23C? and the initial 48C?