Question

How much heat is lost when 0.440 mol of steam condenses at 100 °C?

Answer 1

17,890 J

Step-by-step explanation:

The amount of heat released by a gaseous substance when it condenses is given by the formula

`Q=n\lambda_v`

where

n is the number of moles of the substance

`\lambda_v` is the latent heat of vaporization

The formula can be applied if the substance is at its vaporization temperature.

In this problem, we have:

n = 0.440 mol is the number of moles of steam

`\lambda_v=40,660 J/mol` is the latent heat of vaporization of water

And the steam is already at 100C, so we can apply the formula:

`Q=(0.440)(40660)=17,890 J`