The Economiser in the steam boiler preheats the feed water prior to it being pumped to the boiler.

a$.$ Calculate the amount of heat required to raise the temperature of $120$ litres of water, of specific heat capacity $4200Jk{g}^{-1}{K}^{-1},$ from $16C$ to $80C.$

The feed water is then converted to steam in the boiler.

b$.$ Calculate the thermal energy required to convert the $120$ litres of feed water, at $80C,$ into saturated steam at $100C($assume $1$ bar pressure for your calculations$).$

The specific heat capacity of water is $4200J*k{g}^{-1}*K^{-1}$ and the specific latent heat of vaporisation is $2,260kJ.k{g}^{-1}.$