00:01
Hey there.
00:02
In this problem, we are given this reaction and we are told that the delta h of formation is negative 824 kilojoules per mole.
00:13
So this information you see here is information that was pulled out of the problem.
00:18
And we see that we want to know the mass of iron that are necessary to provide 335 kilojoules of heat.
00:33
Remember the negative signs here just mean that heat is being released or given off.
00:38
It's exothermic.
00:40
All right.
00:41
So let's calculate that mass.
00:44
So we want to produce negative 335 kilojoules of heat.
00:54
Well, from the information we were given, let's calculate how many moles of fe203 we're going to make.
01:03
So we know that it takes or it gives off negative 824 kilojoules for every mole of fe 203.
01:19
So this step here allows us to convert from kilojoules to moles of fe203.
01:27
Well, we want to know information about fe...