Specific heat calculations for carbon and unknown substance

[lynn0808]

a.Determine the amount of energy to raise the temperature of 18 kg of carbon from -5^0C to 17^0C.

B. 200g of a certain substance absorbs 7320 J of energy and experienced a temperature rise from 5^0C to 30^0C. By calcuating its "C" value, identify as near as possible, the unknown substance.


delta t= 17-5=12^0C. M=18kg
C=709j/kg
energy=cXmXdelta t
709J/kg.K X 18kg X12K
energy=3.28 KJ
=3.3 X10^2?

Im not sure what I am doing. Need help

 

[GCT]

a.Determine the amount of energy to raise the temperature of 18 kg of carbon from -5^0C to 17^0C.

B. 200g of a certain substance absorbs 7320 J of energy and experienced a temperature rise from 5^0C to 30^0C. By calcuating its "C" value, identify as near as possible, the unknown substance.


delta t= 17-5=12^0C. M=18kg
C=709j/kg
energy=cXmXdelta t
709J/kg.K X 18kg X12K
energy=3.28 KJ
=3.3 X10^2?

Im not sure what I am doing. Need help

First seems fine , your same strategy needs to be applied to the second question.