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1. One of the reactions in the catalytic converter of a car exhaust is
2NO(g) + 2CO(g) o 2CO2(g) + N2(g)

400 cm3 of NO is mixed with 500 cm3 of CO. What is the total volume of gas when the reaction is complete?

All gas volumes are measured at the same temperature and pressure.
A 600 cm3

B 700 cm3

C 1300 cm3

D The volume cannot be calculated without the molar volume of gas at the appropriate temperature and pressure.
2. To answer this you have to appreciate that 1 mole of any gas occupies the same volume as 1 mole of any other gas at the same temp and pressure.
Hence 100cm3 of NO will be the same number of moles as 100cm3 of CO or N2 or CO2.

You may find you have some of one of the reactants unreacted, and you must include this quantity in your total volume.

So, what do you think the answer is? And why.

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Updated: February 25, 2018
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