Question

10cm3 of a gaseous hydrocarbon C2 Hx required 30cm3 of oxygen gas for complete combustion if steam and 20cm3 of carbon iv oxide produced what is the value of x

Answer 1

First we can write the chemical equation of hydrocarbon burning:

C₂H_x+(2+0.25x)O₂=2CO₂+0.5xH₂O

Then we can see that volumes of hydrocarbon and oxygen are related as 1:3. We can make an equation:

2+0.25x=3

x=4

Answer: x=4