A vessel of mass 100g [S.H.C. = 0.2 cal g-1°C-1] contains 500g of water at 37°C. Calculate the amount of ice, which should be added to the vessel, so that the final temperature is 17°C.
[S.H.C. of water = 1 cal g-1°C-1 and S.L.H. of ice = 80 cal g-1]
