If 5,100 joules of heat are given off when a sample of water freezes, what Is the mass of the water?

${H}_{2} O \left(l\right) r i g h t \le f t h a r p \infty n s {H}_{2} O \left(s\right) + \Delta$
We need data to assess your problem, namely $\Delta {H}_{\text{fusion}}^{\circ}$ for water.