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Introduction to Water

an organic co...

Question

an organic compound containing carbon, hydrogen, nitrogen present in the ratio 3:1:3.5. find out its molecular formula if the vapour density is 60

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Solution

Dear student
Relative molecular mass = 2 x vapour density
= 2x 60
= 120

$R a t i o o f C : H : N i s 3 : 1 : 3.5 I n o r d e r t o d e t e r m i n e t h e n o . o f a t o m s p r e s e n t i n t h e m o l e c u l a r f o r m u l a, w e c a l c u l a t e t h e w e i g h t o f e a c h e l e m e n t o n t h e m o l e c u l a r w e i g h t 120 W t . o f C = 3 x 120 / 7.5 = 48 T h u s, n o . o f C a t o m s = 48 / 12 = 4 W t . O f H a t o m = 1 \times 120 / 7.5 = 16 n o . o f H a t o m = 16 / 2 = 8 W t . o f N a t o m = 3.5 \times 120 / 7.5 = 56 n o . o f N a t o m = 56 / 14 = 4 T h e m o l e c u l a r f o r m u l a i s t h u s C_{4} H_{8} N_{4}$
Regards

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