00:01
All right, so this is going to be a three -part question here.
00:03
So we've got a 405 .3 gram substance, and it's starting at a temperature of negative 23 .1, and we're warming it up to its freezing point, which is 17 .6.
00:16
So we're going to do 17 .6 minus the negative 23 .1.
00:20
And this is a solid, so we're going to use the heat capacity of the solid, the 2 .96, and that will tell us our first heat.
00:29
Once we get to the point where it's a solid, so we heated it up to a solid.
00:33
Once we get to the point where it's a solid, it's going to level off while it melts, and then we'll heat it up as a liquid.
00:40
So this is solid, this is liquid, and this is like the phase change between the two, if you're looking at temperature versus heat being added.
00:47
It.
00:48
All right.
00:48
If i'm considering my second energy change, we just have to look at the heat of fusion, which is 8 .04 kilojoules per mole.
00:59
And again, we're going to go from our moles to our grams, and we're going to use that 405 .3 grams.
01:07
We need to know the molar mass in order to do this switch.
01:10
So we're going to put that 92 .41 down here with the grams, and that'll be one mole.
01:16
And that'll show the grams canceling and the moles canceling...