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AP Chemistry 1.3 Rearrangement and Reorganization of Atoms. How many moles of oxygen will be required for each mole of propane?

Language:
English Language

Transcript

00:04

Here’s your Shmoop du jour, brought to you by propane, the movement that advocates for [Window panes outside a building]

00:09

windows.

00:10

Here’s today’s question:

00:12

When propane, a flammable compound commonly used in gas grills, is ignited, it will react

00:18

with oxygen in a combustion reaction.

00:21

The reaction can be seen below: C3H8 + O2 ? CO2 + H2O

00:25

Once this equation is correctly balanced, how many moles of oxygen will be required

00:30

for each mole of propane?

00:32

And here are your potential answers…

00:35

Okay, flex those fingers, crack those knuckles, and practice opening a jar or two, because [Man attempting to open a jar]

00:40

we’re gonna have to balance this whole equation by hand.

00:43

We’re going to release all the carbon in our propane in the form of carbon dioxide. [Carbon dioxide released from propane]

00:47

That means that the carbons contained in carbon dioxide should be equal to the carbons in

00:51

the propane.

00:52

So let’s balance those guys first. [Carbon molecules balancing on a scale]

00:53

Grab your umbrella!

00:54

Or whatever people use to balance on tightropes.

00:57

Okay, so there are three carbons on the left and one on the right, so we’ll need a coefficient

01:01

of 3 in front of that carbon dioxide.

01:04

Now we need to ask a question to our hydrogen atoms: water you doing? [Oxygen smiling with two hydrogen atoms]

01:09

Well, our hydrogen atoms are all busy forming water molecules when the propane is ignited…

01:15

Which means that we need to balance the hydrogens in propane with the hydrogens in water on

01:20

the other side of the equation.

01:22

Because for every propane, there is an equal and opposite con-pane.

01:25

That doesn’t mean anything. [Girl looking at a book]

01:26

Don’t look that up.

01:27

To balance our hydrogens, we observe that there are two hydrogens in water and eight

01:31

in propane, so it’ll take four water molecules to balance the equation.

01:34

But we’re not done!

01:36

No celebratory fist bumps just yet… [Boy offering a fist bump]

01:38

We still have to balance our oxygens.

01:40

On the right side of the equation we have 6 oxygens from carbon dioxide and 4 from water

01:44

for a total of 10.

01:46

On the left, we have two per molecule, so let’s put a five in front of that oxygen

01:51

to balance it out.

01:52

That must mean that our answer is D, since the coefficient in front of our oxygen molecule [Number 5 circled]

01:57

is 5.

01:58

Next time, maybe let’s just stick to charcoal. [Santa jumping down a chimney]

02:00

Or good ol’ firewood.

02:02

Seriously, that propane stuff was way complicated.

02:04

Okay, now it’s celebratory fist bump time.

02:07

Pound it. [Boy offering a fist bump]

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