# A 315 g sample of water is heated until it has completely melted. How much heat energy was used?

Jun 2, 2016

We need the latent heat of fusion of ice.

#### Explanation:

We want the energy involved in the phase transition:

${H}_{2} O \left(s\right) + \Delta \rightarrow {H}_{2} O \left(l\right)$

This site lists the latent of fusion of water as $334 \cdot k J \cdot k {g}^{-} 1$. You have been given a mass of ice to start. We assume that the water and ice (i.e. the product and the reactant) remain at $0$ ""^@C.

$334 \cdot k J \cdot k {g}^{-} 1 \times 0.315 \cdot k g$ $=$ ??kJ