Question

If 5 L of propane is burned, predict the volume of oxygen? at the same temperature and pressure required for complete combustion.

Chem 20 - Empirical properties of gases

Answer 1

We need a stoichiometric equation to represent the combustion reaction....

Explanation:

And with combustion reactions, the normal rigmarole is to (i) balance the carbons as carbon dioxide, (ii) balanced the hydrogens as water, and (iii) THEN balanced the oxygens...

`C_3H_8(g) + 5O_2(g)rarr3CO_2(g) + 4H_2O(l) + Delta`

And so if `5*L` of propane are completely combusted, stoichiometry demands that `25*L` dioxygen at least are present....under equivalent pressure and temperature VOLUME OF THE GAS is proportional to the MOLAR QUANTITY....