An organic compound made up of `C, H`, and `N` contains `20%N`. The molecular mass of the organic compound is

Options

A. `70`
B. `140`
C. `100`
D. `65`

Answer

A

Explanation

Percentage of N `= ("Mass of N")/("Molecular mass of the compound")xx100`
`:. 20=(14)/("Mol. Mass")xx100`
`:'` the compound must contain at least on nitrogen atom.
`:. M = (14xx100)/(20)=70`
Note: However, if the compound contains two nitrogen atoms, the molecular mass of the compound = 140