Question

an organic compound have carbon = 40.6 5%, hydrogen= 8.55%, nitrogen =23 .7%and rest is oxygen .If the vopour density is 29.5 .calculate the molecular formula .
​

Answer 1

Explanation:

Molecular mass =2×Vapor density=59 g mol

−1

% C=40.65⇒

100

59×40.65

=24 g/moles=

12

24

=2 moles

% H=8.55⇒

100

59×8.55

=5 g/moles=

1

5

=5 moles

% N=23.77⇒

100

59×23.77

=14 g/moles=

14

14

=1 moles

Mass of oxygen =59−43=16 g/moles=1

Molecular formula is C

2

H

5

NO

Answer 2

Explanation:

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Molecular mass =2×Vapor density=59 g mol

−1

% C=40.65⇒

100

59×40.65

=24 g/moles=

12

24

=2 moles

% H=8.55⇒

100

59×8.55

=5 g/moles=

1

5

=5 moles

% N=23.77⇒

100

59×23.77

=14 g/moles=

14

14

=1 moles

Mass of oxygen =59−43=16 g/moles=1

Molecular formula is C

2

H

5