specific heat refers to specific heat capacity, ie. the amount of heat needed to raise the temperature of a unit amount of subtance by one unit temperature. Its SI unit is J.Kg^{-1}K^{-1}

Using Q = mc(dT) where

Q: heat applied

m: mass of substance

c: specific heat capacity

dT: change in temperature

-40.8J = (13.34 x 10^{-3} kg) X c X (43 - 50 K)

rearrange the above equation to solve..