Question

Question #d857d

Answer 1

We need the latent heat of fusion of ice..........and get `16.7*kJ`.

Explanation:

This site quotes the latent heat of fusion of water as `333.55*J*g^-1`, and this the measures the enthalpy change for the transition:

`H_2O(s)+Delta rarrH_2O(l)`.

These data should have been supplied with your question, as, clearly, you (or I!) could not be expected to remember it. Since both the ice and the water are at `0` `""^@C` we only need to assess the enthalpy of the phase change.........and thus......

`50*gxx333.55*J*g^-1xx10^-3*kJ*J^-1=16.7*kJ`

How would the answer change if we were asked to assess the enthalpy for the transition liquid water to solid ice?