1.

An organic compound made up of `C, H`, and `N` contains `20%N`. The molecular mass of the organic compound isA. `100 u`B. `65 u`C. `140 u`D. `70 u`

Answer» Correct Answer - D
As per the information, we can only find out the minimum molecular mass of the compound considering one `N` atom per molecule. Thus,
`%` of `N = ("Atomic mass of N")/("Minimum molecular mass of compound") xx 100%`
`20% = (14 u)/("Minimum molecular mass") xx 100%`
or Minimum molecular mass of compound `= (14 u)/(20 %) xx 100%`
`=70 u`


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