[mrmcpang]

The reaction between carbon monoxide and oxygen is:

2CO(g) + O2(g) -> 2CO2(g)

When 20L of carbon monoxide reacts with 5L of oxygen at the same temperature and pressure, what is the volume of carbon monoxide left unreacted?

I'm having trouble with this question, so if you could show FULL working out, that would be absolutely appreciated. Thanks

[Arkcon]

Well, this isn't an atmosphere question, but instead a stoichiometry question.  You should have guessed that, because nobody wants to hang around in an atmosphere of carbon monoxide.

You've been given some volumes, and you have another equation too -- the balanced chemical equation relates moles of reactants to moles of products.  You have some conversions to do, and you should have learned it recently if you're getting this problem.  Can you quickly recall, or look up in your text book or class notes, an equation relating moles of gas and volume?  They say temperature and pressure remain the same -- why do they mention that?  Does that give you a hint to the formula you need?

And no, we don't give complete answers on this forum.  You agreed to that when you registered.  See the Forum Rules above.  Try and do as much of the problem as you can, and ask us if you need more help.