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Standard XII

Chemistry

Empirical & Molecular Formula

What will be ...

Question

What will be the molecular formula of a compound which has the empirical formula, $C_{3} H_{6} O_{2}$ and a mass of 148 a.m.u.?

C_{6} H_{12} O_{4}

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C_{2} H_{6} O_{2}

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C_{9} H_{18} O_{6}

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C_{2} H_{3} O

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None of the above

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Solution

The correct option is A $C_{6} H_{12} O_{4}$
Empirical Formula = $C_{3} H_{6} O_{2}$
$n = \frac{M_{M o l e c u l a r m a s s}}{M_{E m p i r i c a l m a s s}} = \frac{148}{74} = 2$
Molecular Formula $= n \times$ Empirical Formula $= n \times C_{3} H_{6} O_{2} = C_{6} H_{12} O_{4}$

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Similar questions

Q. Give the empirical formula of:

Benzene

(C_{6} H_{6})

Glucose

(C_{6} H_{12} O_{6})

Acetylene

(C_{2} H_{2})

Hydrogen per oxide

(H_{2} O_{2})

Q. Aspirin

(C_{9} H_{8} O_{4})

is prepared by reacting salicylic acid

(C_{7} H_{6} O_{3})

and acetic anhydride

(C_{4} H_{6} O_{3})

C_{7} H_{6} O_{3} + C_{4} H_{6} O_{3} \to C_{9} H_{8} O_{4} + C_{2} H_{4} O_{2}

How many moles of salicylic acid should be used to prepare six 5-grain aspirin tablets? (1 g = 15.5 grains)

Q. What are the peculiarities of the series

C H_{4}

C_{2} H_{6}

C_{3} H_{8}

C_{4} H_{10}

_____etc? Write the general formula of these compounds.

Q. What is the melting point of

0.2 L

water containing

6.20 g

C_{2} H_{6} O_{2}

Q. (a) Compound

(A)

with molecular formula

C_{2} H_{4} O

reduces Tollen's reagent.

(A)

on treatment with

H C N

gives compound

(B)

. Compound

(B)

on hydrolysis with an acid gives compound

(C)

with molecular formula

C_{3} H_{6} O_{3}

which is an optically active compound. Compound

(A)

on reduction with

N_{2} H_{4} / C_{2} H_{5} O N a

gives a hydrocarbon

(D)

of molecular formula

C_{2} H_{6}

. Identify

(A), (B), (C)

and

(D)

and explain the reactions.
(b) Ionic conductance at infinite dilution of

{A l}^{3 +}

and

{S O}_{4}^{2 -}

are

189 {o h m}^{- 1} {c m}^{2} g m

{e q u i v}^{- 1}

and

160 {o h m}^{- 1} {c m}^{2} g m

{e q u i v}^{- 1}

. Calculate equivalent and molar conductance of the electrolyte at infinite dilution.

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What will be the molecular formula of a compound which has the empirical formula, C3H6O2 and a mass of 148 a.m.u.?

The correct option is A C6H12O4Empirical Formula = C3H6O2n=MMolecular massMEmpirical mass=14874=2Molecular Formula =n×Empirical Formula =n×C3H6O2=C6H12O4

What will be the molecular formula of a compound which has the empirical formula, $C_{3} H_{6} O_{2}$ and a mass of 148 a.m.u.?

The correct option is A $C_{6} H_{12} O_{4}$
Empirical Formula = $C_{3} H_{6} O_{2}$
$n = \frac{M_{M o l e c u l a r m a s s}}{M_{E m p i r i c a l m a s s}} = \frac{148}{74} = 2$
Molecular Formula $= n \times$ Empirical Formula $= n \times C_{3} H_{6} O_{2} = C_{6} H_{12} O_{4}$