00:03
Hello there, in this question we are given the mass in grams of water.
00:09
And what we want to know is how much energy it's going to take to boil the water.
00:14
So we're trying to convert to energy and that would be in kilojoules.
00:23
Well, it's going to take us two steps to get to this answer.
00:28
In our first step, we need to convert from mass to moles.
00:35
And we can do that by using the molar mass.
00:37
Molar mass is the mass of one mole of a substance in grams.
00:41
And for water, the molar mass is given to us in the problem.
00:46
Once we're at moles, then we can convert to the amount of energy required by using the delta h of vaporization.
00:55
That is the amount of energy it takes per mole to change the water at its boiling point from liquid to gas.
01:04
So these are our two steps.
01:05
Let's go ahead and start with the mass of water that we have.
01:12
266 .9 grams.
01:15
And the first step is to use that molar mass...