Question

a new liquid substance has been discovered the freezes at 50 degrees celsius. a scientist poured the liquid (which was at 50 degrees celsius) into a 0.68 kg cup which caused some, but not all, of the liquid to freeze (only 0.22 kg of the liquid froze). as a result, the cup gained 67000 J of heat until thermal equilibrium was reached. determine the latent heat of the substance & the initial temperature of the cup.

A new liquid substance has been discovered that freezes at 50°C. A scientist poured the liquid (which 50°C) into a 0.68 kg cup (Ccup = 895 J/kg.K) which caused some, but not all, of the liquid to freeze (or kg of the liquid froze). As a result, the cup gained 67,000 J of heat until thermal equilibrium was reach Determine the latent heat of the substance & the initial temperature of the cup. cup,

Answer 1

67000 J & by freezing this of 0.22 1. Since the cup gets energy is provided kg of liquid. 1. LF a = 67000 . 0.22 L=304-54 KJ /kg T. let initial temperature be Final temperature is soo. so Mc Cup (Sout)=67,000 7 So-T= 67,000 06878075 so-T=110.0 T==600 : E-60.0°C