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Finding the formula of a hydrocarbon
Find the formula of a gaseous hydrocarbon from the following data:
10cm3 of the gaseous hydrocarbon were mixed with 100cm3 of oxygen. After the explosion and cooling, the volume was 75cm3. It was reduced to 35cm3 after absorption with potassium hydroxide solution.
10cm3 of the gaseous hydrocarbon were mixed with 100cm3 of oxygen. After the explosion and cooling, the volume was 75cm3. It was reduced to 35cm3 after absorption with potassium hydroxide solution.
Reply 1
Volume of O2 used=100-35=65
Volume of CO2 released=75-35=40
Therfore the mole ratio w.r.t Hydrocarbon:
O2:CO2:CxHy
6.5:4:1
Using the equation:
CxHy+(x+y/4)O2---->(x)CO2+(y/2)H2O
using the ratios x=4
x+y/4=6.5
4+y/4=6.5
y=10
The formula of compound C4H10
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