CHEM&$161$

Lab#$2$: Heat of Fusion of Water

Prelab

As warm water cools down explain what happens in terms of energy at the molecular level.

$125\mathrm{.}0g$ of water is cooled from $25\mathrm{.}3C$ to $1\mathrm{.}5C.$ How much heat in $kJ$ was evolved by the water?

If the volume of ice was $40\mathrm{.}5mL,$ determine the mass of ice melted. Show all your work.

Determine the heat of fusion of ice in $k\frac{J}{g}$ using your answers from $2$ and $3.$

Using the answer from $4$ determine the molar heat of fusion of water in $k\frac{J}{m}ol.$

Look up the value for the molar heat of fusion of water and report it here.

Use the answer from #$6$ to determine the percentage error in the molar heat of fusion value calculated in #$5.$

$\%$ error $=\frac{(\text{y}\text{o}\text{u}\text{r}\text{v}\text{a}\text{l}\text{u}\text{e}-\text{t}\text{h}\text{e}\text{i}\text{r}\text{v}\text{a}\text{l}\text{u}\text{e})}{\text{t}\text{h}\text{e}\text{i}\text{r}\text{v}\text{a}\text{l}\text{u}\text{e}}100$