an immersion heater is placed in crushed ice at -40℃, contained in a perspex jar, such that water at 50℃ is formed.If the power of the heater is 200W and it is switched on for 3min 20s , calculate the initial mass of ice.S.H.C. of ice =2.1J/g℃ and L.H. of ice =336J/g.
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