Question

2. The water is then heated to its boiling point. Calculate the specific latent heat of
vaporisation if there was 330 g of water before the loo was added, and 813,600 J of
energy is supplied to boil all of the water once it has reached its boiling point.
Answer:

Answer 1

Answer:

2465 J/g

Explanation:

The amount of energy required to boil a sample of water already at boiling point is given by

$Q=m\lambda_v$

where

m is the mass of the water sample

$\lambda_v$ is the specific latent heat of vaporization of water

In this problem, we know

$Q=813,600 J$

$m = 330 g$

Solving the equation for $\lambda_v$, we find

$\lambda_v = \frac{Q}{m}=\frac{813600}{330}=2465 J/g$