A cooking vessel on a slow burner contai...

A cooking vessel on a slow burner contains 5 kg of water and an unknown mass of ice in equilibrium at `0^@C` at time `t=0`. The temperature of the mixture is measured at various times and the result is plotted as shown in Fig. During the first 50 min the mixture remains at `0^@C`. From 50 min to 60 min, the temperature increases to `2^@C` Neglecting the heat capacity of the vessel, the initial mass of the ice is

`(10)/(7)kg`

`(5)/(7)kg`

`(5)/(4)kg`

`(5)/(8)kg`

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