You are Here: Home

# gas volume question Watch

1. can someone explain the theory behind this question? i would have thought the answer is ethane?
2. you would use the formulas

n=m/Mr then n=v/24
if you wanted to do it the long way
but you can tell from the relative mass that ethane would have the greatest
3. (Original post by happiness12)
you would use the formulas

n=m/Mr then n=v/24
if you wanted to do it the long way
but you can tell from the relative mass that ethane would have the greatest
4. (Original post by gomc)
can someone explain the theory behind this question? i would have thought the answer is ethane?

1 mole of any gas will fill the same volume at a given temperature and pressure according to the ideal gas law (pV=nRT).

This means that when we think about taking 1 gram of a substance, the gas with the largest volume will be the one with the smallest atomic/molecular mass. This is because 1 gram of a light gas consists of more atoms/molecules than 1 gram of a heavy gas.

If we think about these gases (using the atomic masses given) ethane (C2H6) has a mass of 30 amu;
Oxygen exists as O2 mass 32 amu; Fluorine exists as F2 mass 38 amu; Ne exists as atoms mass 20 amu
so 1 gram of neon must have the largest volume.

TSR Support Team

We have a brilliant team of more than 60 Support Team members looking after discussions on The Student Room, helping to make it a fun, safe and useful place to hang out.

This forum is supported by:
Updated: September 18, 2016
Today on TSR

Can it be done?

### Give feedback to Cambridge here

Discussions on TSR

• Latest
• ## See more of what you like on The Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

• Poll
Discussions on TSR

• Latest
• ## See more of what you like on The Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

• The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE