Question

How much heat is needed to raise the temperature of 8g of water by 15oC?

Answer 1

Answer: 502.08 J

Explanation:

The heat (thermal energy) needed in to raise the temperature in a process can be found using the following equation:

$Q=m.C.\Delta T$   (1)

Where:

$Q$ is the heat

$m=8 g$ is the mass of the element (water in this case)

$C$ is the specific heat capacity of the material. In the case of water is $C=4.184\frac{J}{g\°C}$

$\Delta T=15\°C$ is the variation in temperature  (which is increased in this case)

Knowing this, let's rewrite (1) with these values:

$Q=(8 g)(4.184\frac{J}{g\°C})(15\°C)$  (2)

Finally:

$Q=502.08 J$