How much heat is needed to raise the temperature of 5g of water by 19oC?

The water's specific heat is C=4.184 J g^-1 C^-1.

The water's specific heat tells you that you need 4.184 J of energy in the form of heat in order to increase the temperature of 1 g of water by 1∘ C.

ΔT, is the change in temperature, will be equal to

ΔT = Tfinal - Tinitial We know that ΔT=19∘C To increase the temperature of 5 g of water by 1∘ C, you'd need 5*4.184/1=20,92 20,92*4.184 = 87,529 J88 KJ heat is needed to raise the tempertaure of 5g of water by 19.