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Chemistry iGCSE volume and gases

Stuck on this question - please help!

20dm3 methane was burned in pure oxygen: CH4(g) + 2O2(g) CO2(g) + 2H2O(l)

What is the volume of carbon dioxide made?
Reply 1
The volume ratio of the gases will follow the mole ratio of 1:1

So vol of CO2 = 20 dm3

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