Question

How much energy is required to freeze 20 ml of water already at 0.0 0C?

Answer 1

Given

Amount of water,

$m=20\text{ ml}$

Temperature is,

$T=0.00C$

To find:

Energy required to freeze the water.

Explanation:

The latent heat of fusion is

$L=33.5\times10^4\text{ J/}kg$

Converting the amount of water to kg,

$m=0.020kg$

Thus the energy required is:

$\begin{gathered} H=mL \\ \Rightarrow H=0.020\times33.5\times10^4=0.67\times10^4J \end{gathered}$

Conclusion:

The amount of energy required is

$0.67\times10^4J$