A orange compound used for welding operation contains the following composition by mass : `C=92.3%`,H=7.7%`. Find out the molecular formula of the compound . At STP, 10.0 L of the gas is found to weight 11.6 g .

Explanation

Determination of Molecular formula

Empirical formula is CH
Molecualr formula mass `(1xx12+(1xx1)12+1=13`
`n=("Molecular mass")/("Empirical formula mass")`
Molar mass `=("wt. of the substance" xx "Moar volume")/("vol. of the substance")` at STP
Molar volume at STP `=2.24xx10^(-2)m^(3)=22.41=22400 ml`
Molar mass of the gas at STP `=(11.6xx22.4)/(10)=22.9=26`
`n=(26)/(13)=2`
Molecular formula `= n xx("emp. formula ")=2xx(CH)=C_2H_2`.