A piece of ice (heat capacity =$2100Jk{g}^{-1}{.}^{\circ }{C}^{-1}$ and latent heat =$3.36\times {10}^{5}Jk{g}^{-1}$) of mass m grams is at $-5^{\circ }C$ at atmospheric pressure. It is given 420 J of heat so that the ice starts melting. Finally when the ice-water mixture is in equilibrium, it is found that 1 gm of ice has melted. assuming there is no other heat exchange in the process, the value of m is

Views: 744 students