Question

How much heat is required to convert steam of 100c to water of 100c?

Answer 1

`2257 (kJ)/(kg)` must be removed from the steam.

Explanation:

The referenced website says "The latent heat of vaporization is the amount of heat required to convert a unit mass of a liquid into vapor without a change in temperature." A table on the page says that the heat of vaporization of water is `2257 (kJ)/(kg)`.
Reference:
https://www.engineeringtoolbox.com/fluids-evaporation-latent-heat-d_147.html

So converting steam of 100c to water of 100c would require removing 2257 kJ of heat from each kg of the steam.

I hope this helps,
Steve