The specific heat of wood is 2.03 J/g C. How much heat is needed to raise the temperature of 550 g of wood from -15.0 C to 10.0 C?
You'd need +28 kJ of heat.
The equation that establishes a relationship between supplied heat and increase in temperature looks like this
A substance's specific heat tells you how much heat is needed to raise the temperature of 1 gram by
SInce you have more than 1 gram of wood and the temperature change is larger than 1 degree Celsius, you'll of course require a significant amount of heat.
Plug your values into the equation and solve for
Rounded to two sig figs, the number of sig figs you gave for the mass of the sample, and expressed in kilojoules, the answer will be
SIDE NOTE The + sign mens that heat is supplied to the sample.