Determine the formula of the alkene, the combustion of which requires a volume of oxygen

Determine the formula of the alkene, the combustion of which requires a volume of oxygen, 9 times the volume of the hydrocarbon itself.

1. Let us write down the equation of alkene combustion using the general formula and substituting n instead of indices:

CnH2n + (n + 0.5n) O2 → nCO2 + nH2O;

2. the ratio of the volumes of the reacting substances is comparable to the ratio of their chemical quantities. Therefore, the amount of oxygen will be related to the amount of alkene as 9: 1:

v (O2): v (CnH2n) = 9: 1;

(n + 0.5n): 1 = 9: 1;

n + 0.5n = 9;

1.5n = 9;

n = 6;

3. substitute the found value of the index and write down the alkene formula: C6H12.

Answer: Hexene C6H12.