Need help.... Dont know how to solve correctly. a) Determine the amount of energy to raise the temperature of 18kg of carbon from -5celsius to 17celsius. b) 200g of a certain substance absorbs 7320J of energy and experienced a temperature rise form 5celsius to 30celsius. By calculating its 'C' value, identify as near as possible, the unknown substance. here's some work I did delta t= 17-5=12Celsius. M=18kg C=709j/kg energy=cXmXdelta t 709J/kg.K X 18kg X12K energy=3.28 KJ =3.3 X10^2? how do you solve for b. I don't know how to do it. Is this working correct?