Specific heat capacity relates only to the energy required for a change in temperature. Specific latent heat relates only to the energy required for a change in state. If a change in internal energy of a material will cause it to change temperature and change state, both equations can be used.
What happens when 1 kilogram (kg) of water at 75 degrees Celsius (°C) is heated with 2.5 megajoules (MJ) (2,500,000 J)?
The steam started at 100°C and heats up by 72.6°C so is now 172.6°C.
If 0.5 kg of water at 80°C is changed into steam at 110°C, how will the energy be used?
Energy will go into three places.
So the total amount of energy needed to change 0.5 kg of water at 80°C into steam at 110°C would be:
Total amount of energy = 42,000 + 1,130,000 + 9,295 = 1,181,295