# Question #20be5

##### 2 Answers

The latent heat of vaporization of ammonia is

The *latent heat of vaporization* represents the energy you must supply, in the form of heat, to a substance to change it from liquid to vapor.

You're basically dealing with a phase change, during which you supply heat to the liquid ammonia to transform it to steam - *at constant temperature*.

Mathematically, the amount of heat required to vaporize a certain mass of a substance is given by

Plug in your data and solve for

If you round this to one sig fig, the number of sig figs given for 5 kg, the answer will be

#### Explanation:

The "Latent heat of vaporization" for a substance(in this case

We are told that

Hence,

But the question asks for "specific" latent heat,

so we divide by the mass,