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# gas volume question

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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.

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Updated: September 17, 2016
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