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Abnormal Colligative Properties

Benzoic acid ...

Question

Benzoic acid dissolved in benzene will show a molecular weight of

A

244g

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B

61g

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C

122g

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D

366g

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Solution

The correct option is A
244g

The molecules of benzoic acid dimerise in benzene due to hydrogen bonding.

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Similar questions

Q. Benzoic acid dissolved in benzene shows a molecular mass of _______g

m o l^{- 1}

.

Q. Acetic acid dissolved in benzene shows a molecular weight of:

Q. Benzoic acid (molecular weight

= 122

^{- 1}

) associates to form dimer when dissolved in benzene and the osmotic pressure of a solution of

5

g of benzoic acid in

100

5.73

10^{o} C

. What is the percentage association of benzoic acid?

Q. There is 50% dimer formation of benzoic acid

(C_{6} H_{5} C O O H)

in benzene solution.

2 C_{6} H_{5} C O O H ⇌ (C_{6} H_{5} C O O H)_{2}

,
Hence the abnormal molecular weight of benzoic acid ( theoretical value = 122 g

m o l^{- 1}

Q. If benzoic acid (mol. mass = 122) is associated into double molecules when dissolved in benzene and the osmotic pressure of a solution of 5 g of benzoic acid in 100 mL benzene is 5.73 atm at

10^{o} C

, what is the percentage association of benzoic acid?

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