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AP Chemistry 1.2 Laws of Thermodynamics 20 Views


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Description:

AP Chemistry 1.2 Laws of Thermodynamics. What is the standard enthalpy for the following reaction?

Language:
English Language

Transcript

00:04

Here’s your Shmoop du jour, brought to you by standards.

00:07

They're the difference between living in this room… [Boy playing in his bedroom]

00:11

And this room… Alrighty, here’s our question:

00:14

What is the standard enthalpy for the following reaction, given the standard enthalpies of

00:20

formation?

00:21

Here's the given reaction…lots of no's in there… [Chemical reaction equation]

00:24

And we're given the heats of formation for NO, N2O and NO2.

00:29

And here are our potential answers: This reaction is saying, “No, no, no!”

00:38

But we’re saying, “yes, yes, yes” to finding the standard enthalpy of the reaction.

00:42

Heh. Classic chemistry joke… Because nitric oxide is NO…? [Man thrown banana skins at him on stage]

00:47

Well we thought it was classic.

00:49

Anyway, to solve this problem, we need to find the standard enthalpy of reaction using

00:53

the following relationship: The enthalpy of reaction is equal to the sum

00:57

of the enthalpies of formation the products minus the sum of the enthalpies of formation [enthalpy of reaction definition]

01:04

of the reactants. Alright, well unlike staying awake after a

01:08

big lunch, this is actually pretty easy. In this reaction, our products are N2O and

01:13

NO2. We need to look at the heats of formation for these molecules given in the problem statement [Heat formation of N2O and NO2]

01:18

and add them up. Next, we see that the reactants are three

01:21

N O molecules, so we need to subtract three times the heat of formation of N O.

01:26

When we do the math, we find that the enthalpy of reaction is negative 154 kJ/mol, which

01:33

is answer (A). And yup, that's all she wrote. We're done.

01:37

Now that we’ve figured out this problem, it's time to reward ourselves with a big lunch…and [Boy eating food and falls asleep]

01:41

maybe a nap…

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