Question

Water at `10^(@)`C is present in a thermally insulated container. Calculate the ratio of mass of ice formed and initial mass of water, if a small crystal of ice is thrown into it.
A. `1/15`
B. `1/17`
C. `2/15`
D. `1/8`

Answer 1

d) let initial mass of water in the container be m.
`m_(1)` = the mass of water converted into ice.
At final thermal equilibrium state, temperature of mixture should be zero.
`therefore` Heat loss by water = heat of fusion of water.
or `ms[0-(-10)]`= `m_(1)L`
or `mxx 1 xx 10 = m_(1) xx 80)` or `m_(1)/m = 10/80 = 1/8`