00:02
There, in this question we are given this balanced chemical equation and the delta h of the reaction, the amount of energy released.
00:11
We know that energy is released because the delta h is negative.
00:16
So what we want to know is how much energy is released if we start with 14 .72 grams of the carbon.
00:26
We're looking at this equation, it's a balanced equation, it releases that much heat.
00:31
So based upon the equation we know that one mole of carbon, if we react one mole of carbon, we are going to produce 393 .5 kilojoules.
00:46
That's what the delta h is telling us for this reaction.
00:49
For one mole of carbon we produce that much energy.
00:54
Well we're given grams of carbon, so in order to use our equality between mole and energy we need to convert from grams to moles.
01:02
So what we need is the molar mass of carbon and we can get that from the periodic table.
01:08
Molar mass is the mass of one mole of carbon atoms in grams.
01:14
So we see that that number for carbon is 12 .01 grams of carbon.
01:18
All right, so we have two equalities that we can now use as conversion factors to get us to our answer...