Question

Can someone help with this question! Please! At STP, gases have a volume of 22.4 L per mole. RTP is room temperature (25 °C) and pressure (1 atm).
What is the molar volume of a gas at RTP?

Answer 1

Can you use the formula PV=nRT?

Answer 2

Yes, but when I do. I get 18.7L

Answer 3

I don't know what I'm doing wrong?

Answer 4

Ok can you show me what you did? And make sure you're using the R that corresponds to the units you are using. There are at least 2 different R's

Answer 5

okay one second

Answer 6

Okay I re-did it and now I get 20.55mols/L so Idk
PV=nRT
n= RT/PV
n=(8.31)(298K)/(101.31kpa)(22.4L)
n=1.09mols
22.4L/1.09mol=20.55

Answer 7

Is it right? Logically yes since a lower temperature reduces pressure and volume.

Answer 8

The answer is 24.5L

Answer 9

but I have no idea how or what I'm doing wrong

Answer 10

Oooh wait. At STP the pressure is 1 atm. Since at RTP the pressure is the same, the only change here are for the temperature and volume. So we can use the law V1/T1=V2/T2

Answer 11

Oh. Okay I'll try that. Thanks. :)

Answer 12

it works! Thank you so much!

Answer 13

You're welcome. Sorry I didn't see that earlier. Would've made this shorter. Any other questions?