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8. Leo heats a sample X of 2 kg from solid at 20 C to gas by a 750 W heater. The temperature T of
8. Leo heats a sample X of 2 kg from solid at 20 C to gas by a 750 W heater. The temperature T of X changes with time t as shown. T/ C 300 - 200 - 100- 0 10 20 30 40 t / min (a) Find the specific latent heat of (i) fusion and (ii) vaporization of X. (b) Find the specific heat capacity of X when it is in (i) solid state and (ii) liquid state respectively. (c) What will the value in (a) be if (i) X doubles its mass? (ii) the heating power is halved?12. Roy prepared 5 kg soyabean milk at 30 .C. To keep it cool, he adds 1.5 kg of ice at -15 'C to the milk. Assume all ice is melted. What will be the final temperature of the mixture? Take c (soyabean milk) = 4000 J kg-1 .C-1
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