An organic compound was found to have contained carbon = 40.65%, hydrogen = 8.55% and Nitrogen = 23.7%. Its vapour - density was found to be 29.5. What is the molecular formula of the compound?

Explanation

Empirical formula = `C_(2)H_(5)NO` Molecular mass = 2`xx` vapour density
= 2 `xx` 29.5 = 59.0
Empirical formula mass of `C_(2)H_(5)NO` = 24 + 5+ 14+16
= 59
n= `("Molecular mass")/("Empirical formula mass") = 59/59 `= 1
`:. ` Molecular formula = `("Empirical formula")_(n)`
Molecular formula = `C_(2)H_(5)NO`