miu.compus = 59 g/mol
100% - 61,01% C - 15,25% H = 23,74% N
notam compusul CaHbNc
100% ................ 61,01% C ............... 15,25% H ........... 23,74% N
59 g/mol .......... 12a g C .............. b g H ................. 14c g N
=> a = 3, b = 9, c = 1
=> Fm = C3H9N