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1. An organic compound is found to contain the
following constituents :
C = 33.8%. H = 4.7%., N - 13:2%, Cl= 33.4%
and rest is Oxygen. Determine its empirical mass?

Emperical formula

C₃H₅NClO

Further explanation  

The empirical formula is the smallest comparison of atoms of compound =mole ratio of the components

The principle of determining empirical formula

Determine the mass ratio of the constituent elements of the compound.  Determine the mole ratio by by dividing the percentage by the atomic mass

mole ratio :

C

H

N

Cl

O

we divide by the smallest mole ratio (0.93)

C : H : N : Cl : O =

Emperical Formula :

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The net force is 100