11.2 Liters in 1 mole?

sexyman · Jul 14, 2007

In kaplan Full Length 5 question 13 it asks all of the following are equal to avogadros number except.

one of the answers is: the number of atoms in 11.2 L of oxygen at STP.

They say this is wrong because "remember at STP there are always 11.2 liters in a mole of atoms, and one mole of atoms is equivalent to avogadros number"

I think im taking crazy pills cause I thought 1 mole = 22.4 L. Am i missing something here?

jochi1543 · Jul 14, 2007

Hm, doesn't make sense to me, either.😕

quiksilver87 · Jul 14, 2007

yeah, you're right...thats how i know it!

RPedigo · Jul 14, 2007

They say number of atoms, not molecules.

1 mole at STP = 22.4L

BUT... oxygen is diatomic, so half the volume is necessary to get a mole of atoms.

Maybe that's what they mean?

sexyman · Jul 14, 2007

ugh good call- i dont know what I hate more kaplan or chemistry

vicinihil · Jul 14, 2007

sexyman said:
ugh good call- i dont know what I hate more kaplan or chemistry

haha that's why mr. Riverside got a 38

RoadRunner17 · Jul 14, 2007

and as far as I can tell, he is a chemist. So, go figure 😉

jochi1543 · Jul 14, 2007

RPedigo said:
They say number of atoms, not molecules.

1 mole at STP = 22.4L

BUT... oxygen is diatomic, so half the volume is necessary to get a mole of atoms.

Maybe that's what they mean?

Their general statement ""remember at STP there are always 11.2 liters in a mole of atoms, and one mole of atoms is equivalent to avogadros number"" is what strikes me as possibly incorrect, though. A mole of ANY gas is 22.4 liters at STP. Therefore, the 11.2 thing would be correct only for a diatomic gas. It would not be correct, for example, for neon - Ne.

RPedigo · Jul 14, 2007

vicinihil said:
haha that's why mr. Riverside got a 38

haha. Close!

And Riverside is sweet, regardless of what 99.9% of people (including students at UCR) will tell you. 🙂

RoadRunner17 said:
and as far as I can tell, he is a chemist. So, go figure 😉

Yeah, I'm a chemist... we kinda get an unfair advantage since chemistry majors are general chemistry, physics, and organic chemistry heavy, which is like three out of four subjects tested on the MCAT. We don't get biology though, but 3/4 isn't too bad.

Either way, :luck:

jochi1543 said:
Their general statement ""remember at STP there are always 11.2 liters in a mole of atoms, and one mole of atoms is equivalent to avogadros number"" is what strikes me as possibly incorrect, though. A mole of ANY gas is 22.4 liters at STP. Therefore, the 11.2 thing would be correct only for a diatomic gas. It would not be correct, for example, for neon - Ne.

Exactly. What makes the answer choice the answer choice is they say atoms. If they had said molecules then the diatomic thing has no bearing on how much you'd need, and the answer would be 22.4L.

11.2 Liters in 1 mole?

sexyman

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jochi1543

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quiksilver87

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RPedigo

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sexyman

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RoadRunner17

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jochi1543

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RPedigo

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