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Classification of Functional Groups

Give examples...

Question

Give examples of compounds whose
(a) empirical formula is the same as the molecular formula.
(b) empirical formula is different from the molecular formula.

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Solution

Disclaimer: Any of the examples listed below can be used to answer this question.

(a)

Compound Empirical Formula Molecular Formula

Carbon dioxide

CO₂

CO₂

Carbon monoxide
CO

CO

Water

H₂O

H₂O

Nitric oxide
NO

NO

Nitric acid
HNO₃

HNO₃

Hydrochloric acid
HCl

HCl

(b)

Compound Empirical Formula Molecular Formula

Glucose
CH₂O

C₆H₁₂O₆

Benzene
CH

C₆H₆

Ethyne
CH

C₂H₂

Sodium peroxide
NaO

Na₂O₂

1,2 - dichloroethane
CH₂Cl

C₂H₄Cl₂

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Q. Which of the following statements about molecular and empirical formulas is\ are false?
I. A given compound can have the same, molecular and empirical formula.
II. The molecular formula is a whole number multiple of the empirical formula.
III.

H_{2} O_{2}

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C H_{2} O

and vapour density is 30 is

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