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-1K-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..