When 0.5 kg of aluminum is heated using a 1.5kw heater, the mass of aluminum changes completely into a liquid in 2.1 minutes. During this time its temperature remains constant at 660 Celsius. What is the specific latent heat of fusion of aluminum?

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Answer 1 · 2018-08-08T18:02:31

The latent heat of fusion of aluminium is $=378Jkg^-1$

Mass of aluminium is $m=0.5kg$

Power of the heater is $P=1500W$

The time is $t=2.1mn=126s$

The heat energy supplied to the aluminium is

$H=1500*126=189000J=189kJ$

The latent heat of fusion of aluminium is

$L_f=189/0.5=378Jkg^-1$