Let's say we have some ammonia gas.

We were given, in the original problem, 2 moles of ammonia, so what happens with all the leftover ammonia?

Ammonia is an important fertilizer.

So we have extra ammonia.

We're given 34 grams of ammonia.

So how many moles of ammonia are we given?

We're given 2 moles of ammonia.

So we're given 2 moles.

And then we used 0.8 moles of ammonia.

And we're going to have left 1.2 moles of ammonia.

The ratio of ammonia to oxygen, let me write that down.

So how many ammonia are going to react with that?

Gas

Gas.

Gas?

And we're told that we're given 34 grams of ammonia.

So if I'm given 2 moles of ammonia, this is equal to what?

In that case, ammonia would have been the rate limiting factor.

And we could do the same thing here for ammonium and amonia.

But we could say we have 4 moles of ammonia.

4 times 6 times 10 to the 23 molecules of ammonia.

So what we need to figure out is how many moles of ammonia were we given?

We're given 34 grams of ammonia, 1 mole is 17 grams.

So we've been given 34 grams of ammonia, which is 2 moles.

Gas bottle

Or, another way to write that, if one molecule of ammonia is 17 atomic mass units, then 1 mole of ammonia is how many grams?

So we multiply the entire equation by 4, we have 4 molecules of ammonia.

Or for every 5 moles of oxygen we need 4 moles of ammonia.

We've been given less oxygen than we need for all of this ammonia.

And so you might ask a question, we're only using 0.8 moles of ammonia.

And if you want, you can figure out how many of the original grams of ammonia that is.

I'll write nitrous oxide, it's N2O, this is laughing gas.

You have some oxygen gas or a diatomic oxygen molecule.

Gas, North Sea

Send another pipe down! Right now! It's a gas pocket!

Normally, we need more moles of oxygen than we have ammonia.

If I'm given 2 moles of ammonia, how many moles of oxygen do I need?

I have plenty of ammonia, but I don't have enough oxygen to react with it.

Quite often, the flue gas refers to the combustion exhaust gas produced at power plants.

So I have methane gas plus oxygen gas yields carbon dioxide gas plus water.

Is there any gas?

Inside, a teargas cartridge.

You just figure out how many grams 1 mole of ammonia is, it's 17 grams.

You understand this is a 4 5 ratio, there's always going to be less ammonia than oxygen.

Because for 2 moles of ammonia, I only need 2.5 moles of oxygen.