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Thursday, March 17, 2011

Relationship between molecular formula and empirical formula

Empirical formula the simplest ratio of an element in molecular formula
(Empirical formula)n = Molecular compound

Example of RELATIONSHIP:


COMPOUNDMOLECULAR FORMULAEMPIRICAL FORMULAVALUE OF n
GlucoseC6H12O6CH2O6
Carbon dioxideCO2CO21
WaterH2OH2O1
BenzeneC6H6CH6
Hydrogen PeroxideH2O2HO2
ButeneC4H8CH22
ButaneC4H10C2H52
EthaneC2H6CH32

Example Questions :

(a) What empirical formula of hexane, C6H14?

Solution :
Step 1:
Find simplest ratio between carbon and hydrogen in compound.
[ Use fractional of each element]
= C6/2 H14/2

Step 2:
Divisible is value of n; n=2   ⇒ (empirical formula) n = molecular formula
= (C3H7)2


Step 3:

Empirical formula
= C3H7

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