In an organic compound of molar mass greater than `100` containing only `C`, `H` and `N`, the percentage of `C` is `6` times the percentage of `H` while the sun of the percentage of `C` and H is `1.5` times the percentage of `N`. What is the least molar mass :

Options

A. `175`
B. `140`
C. `105`
D. `210`

Answer

B

Explanation

Let assume `%` of `H` is `x`
`%` of `H = x`
`%` of `C = 6x`
`%` of `N=(7x)/(1.5)`
`{:(,"Element",%,"Ratio of mol","Simplest"),(,H,x,x//1=1,6),(,C,6x,6x//12=1//2,3),(,N,(7x)/(1.5),(7x)/(1.5xx14)=(1)/(3),2),(,because,F.F=C_(3)H_(6)N_(2),,):}`
atomic mass `=70`
molar mass `=140`