If the energy used to heat up a block of 2kg of copper is 115.8 kJ, what is the temperature it was heated to if the starting temperature was 100oC and the specific heat capacity is 386 J/kgK.

Question

temperature needed = energy/ mass x specific heat capacity

temperature needed=115800/2*112.85
the temperature needed 246.25∘C

please let me know what's missing.

ty

Answer 1

246.25°C is close to the answer, but for the wrong reasons.

E=MC(T2-T1)
E=115800 J
T2=unknown
T1=100 °C
C=386 J/(kg-°K)

Solve for T2.

Note: (T2-T1) should be both in °K, but since it is a difference, it is acceptable to have them both in °C.