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Polymerisation of Alkynes

ntacetic acid...

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ntacetic acid dimerises in benzene solution, i=0.8. The % of dimerisation of acetic acid isn

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C H_{3} C O O H

is added in 250 g benzene. Acetic acid dimerises in benzene due to hydrogen bond.

K_{b}

of benzene is 2 K

k g m o l^{- 1}

. The boiling point has increased by 6.4 K. % dimerisation of acetic acid is :

Q. Acetic acid dimerises in vapour phase at

437 K

2 C H_{3} C O O H (g) ⇌ {(C H_{3} C O O H)}_{2} (g)

0.0519 g

of acetic acid was found to have

764.3 m m

437 K

in a container of

21.45 {c m}^{3}

. Calculate degree of dimerisation for acetic acid dimerisation.

Q. The freezing point of a solution of acetic acid (mole fraction =

0.02

) in benzene is

277.4 K

. Acetic acid exists partly as a dimer

2 A ⇌ A_{2} .

Determine the equilibrium constant for dimerisation. Freezing point of benzene is

278.4 K

K_{f}

5

.

Q. The freezing point of

0.02 m o l

fraction solution of acetic acid

(A)

(B)

277.4 K

. Acetic acid exists partly as a dimer

2 A = A_{2}

. Calculate equilibrium constant for the dimerisation. Freezing point of benzene is

278.4 K

and its heat of fusion

Δ H_{f}

10.042 k J m o l^{- 1}

Q. The freezing point of 0.02 mol fraction solution of acetic acid

(A)

(B)

is 277.4 K. Acetic acid exists partly as a dimer

2 A ⇌ A_{2.}

Calculate the equilibrium constant for the dimerisation? The freezing point of benzene is 278.4 K and its heat of fusion is

10.042 K J m o l^{- 1} .

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