00:01
In this problem, before equilibrium, we're given the mass of the water, mass of ice, and the mass of the mixture is just adding these two together, so we get 2 .04 kilograms.
00:11
After the equilibrium, the state of the mixture will be in a one -to -one ratio.
00:17
So, for example, that means the mass of the water is equal to the mass of the ice, which is equal to the mass of the ice water mixture divided by two, which makes that 1 .02 kilograms.
00:28
The mass of the water that changed to ice is equal to the mass of the water before equilibrium minus the final mass of the water, so we get 0 .76 kilograms.
00:40
And to change water to ice, we have an isothermal process.
00:45
So an entropy change, delta s is equal to negative m times l divided by delta t, where l is the latent heat of fusion.
00:54
So for a, delta s of water ice is equal to negative m...