I need help with a science question.?

Question

Calculate the change in thermal energy of 30g of wood that cools from 100ºC to 30ºC. Um any help would be great.

thank you um I'd put you as the best answer but I can't figure out how... lolz see why I need help ;)

Answer 1

You will need the heat capacity of wood to get the answer. (that is how much heat is required to warm, or is released on cooling, of 1 gram of a specific substance 1 degree C).

For pine it's 0.467cal/g C, so:

(100 - 30 C) x 30g x 0.467cal/g C = 981cal is released

The only problem is: whether it should be -981 cal or +981cal I think because heat is leaving the object it's negative, but don't take this as "gospel", I took thermo a long time ago, but this is the general idea how to do the problem. You could probably check in your textbook about the way they define the sign for heat loss.