# Question fe40a

Jul 2, 2016

I found that the water released $31 , 350 J$ of energy

#### Explanation:

We could use the fact that a mass $m$ of water to change from temperature T_i=25°C to T_f=10°C will release energy $Q$ given as:
$Q = m c \Delta T$

Where:

c=4.18J/(g°C) specific heat of water (i.e. the energy in Joules to change of 1°C# the mass of $1 g$ of water);

$\Delta T = {T}_{f} - {T}_{i}$

You get:

$Q = 500 \cdot 4.18 \left(10 - 25\right) = - 31 , 350 J$

The minus sign indicates the loss of energy sustained by the water.

Hope it helps!