Latent+heat+Question+A

(a) Thermal energy given out is equal to the latent heat of 0.40kg of ice,  L v  = //l// v x m = 0.40 x 2200 = 880 kJ

(b) Steam cools from 100 to 0 , ΔΘ = 100-0 = 100K Hence, thermal energy given out, Q = mc(ΔΘ) = 0.40 x 4.2 x 100 = 168 kJ