Question

How much heat is necessary to vaporize 500 g of water at its boiling point?

Answer 1

It depends on what temperature the water is starting at.

Explanation:

If the water is in solid form it would go through 2 phase changes. That equation is:

`q=mDeltaH_f`

The `DeltaH_f` should be given to you or easily accessible.

However, when calculating the amount of heat necessary to heat to a certain temperature you need the initial temperature. That equation looks like this:

`q=mC_sDeltaT`

We're lacking some information in the question. Get that temperature information and we can figure it out.