1.

An organic compound made of C, H and N contain 20%nitrogen. Its minimum molecular weight is

Answer»

70
140
100
65

Solution :`%" of N"=("Mass of N")/("Molecular mass of compound")xx100`
the compound MUST CONTAIN at LEAST one N-atom.
Hence, `20=(14)/("Molecular mass")xx100`
`"or Molecular mass"=(14)/(20)xx100=70`
Note. If two N atoms are present in the molecule, molecular mass would be 140.


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