# What is the total number of joules released when a 5.00-gram sample of water changes from liquid to a solid at 0.0°C?

Dec 9, 2016

I found: $1700 J$

#### Explanation:

here you have a change of phase from liquid to solid where we can evaluate the heat released $Q$ (in Joules) using:

$Q = m {L}_{s}$

where:
$m =$ mass;
${L}_{s} =$ latent heat of solidification of water that from literature is: $3.5 \times {10}^{5} \frac{J}{k g}$

so for $5 g = 0.005 k g$ of water we get:

$Q = 0.005 \cdot 3.4 \times {10}^{5} = 1700 J$