the molecular mass of an organic compound is 78
and its % composition is 92-4% and 76% H. Determine
the molecules formula of the compound. Calculation of
empirical formula
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Weight of C=
100
92.4
×78=72g
Weight of H=78−72=6gm
No. of moles of C=
atomicweightofC
givenweightofC
=
12
72
=6
Similarly No. of moles of H=
atomicweightofH
givenweightofH
=
1
6
=6
∴ molecular formula =C
6
H
6
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