A COMPOUND OF  CARBON, HYDROGEN,& NITROGEN CONTAINS THESE ELEMENTS IN RATIO 9:1:3.5 CALCULATE EMPIRICAL FORMULA IF ITS MOLECULAR MASS IS 108, WHAT IS MOLECULAR FORMULA?

Asked by Ashish nandal | 9th May, 2014, 07:42: PM

Expert Answer:

Element

Mass ratio

Atomic mass

Relative Number of atoms

Simplest ratio

C

9

12

9/12 = 0.75

0.75X4=3

H

1

1

1/1=1

1X4=4

N

3.5

3.5

3.5/14=0.25

0.25X4=1

 

Empirical ratio = C3H4N

Empirical formula mass = (3x12)+(4x1)+14= 54

n= Molecular mass               = 108 = 2

    Empirical formula mass         54 

Molecular formula = (empirical formula)= (C3H4N)2  = C6H8N2

Answered by Vaibhav Chavan | 12th May, 2014, 09:29: AM