00:01
If our balanced chemical reaction is 4 moles of ammonia, nh3, reacting with 5 moles of o2 to produce 4 moles of no and 6 moles of h2o with a delta h of negative 905 .48 kilojoules for the reaction as written, then if we have 12 .00 grams of ammonia and sufficient oxygen, ammonia will be the limiting reactant.
00:37
We can convert the grams of ammonia into moles of ammonia using the molar mass of ammonia, 1 mole nh3 has a mass of 17 .0305 grams.
00:52
Then from the stoichiometry of the reaction, we see that when 4 moles of ammonia react, we release 905 .48 kilojoules.
01:05
So if just 12 moles react, we'll release, so it's negative, 159 .5 kilojoules of energy.
01:19
Then for the second question, it tells us that 397 .2 kilojoules of energy was released, so how many grams of water are produced? for this one, it'll be a unit conversion calculation again, but we'll start with the energy, negative 397 .2 kilojoules...