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When 20 g of naphthoic acid (C11H8O2) is...

When 20 g of naphthoic acid `(C_11H_8O_2)` is dissolved in 50 g of benzene `(K_f=1.72K kg mol^-1)`, a freezing point depression of 2 K is observed. The van't Hoff factor(i) is

A

0.5

B

1

C

2

D

3

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When 20 g of naphthoic acid (C_11H_8O_2) is dissolved in 50 g of benzene , a freezing point depression of 2K is observed. The vant Hoff factor (i) is [ K_f="1.72 K kg mol"^(-1) ]

2g of benzoic acid (C_6H_5COOH) dissolved in 25 g of benzene shows a depression in freezing point equal to 1.62 K. Molal depression constant for benzene is 4.9 k kg mol^-1 . What is the percentage association of acid if it forms dimer in solution ?

0.6 mL of acetic acid (CH_3COOH) , having density 1.06g mL^-1 , is dissolved in 1 litre of water. The depression in freezing point observed for this strength of acid was 0.0205^@C . Calculate the van't Hoff factor and the dissociation constant of acid

34.2 gm Sucrose (Molecular wt 342) is dissolved in 1000 gm of water. Find the freezing-point of the solution kf = 1.86 K Kg mol^-1

1.00 g of a non-electrolyte dissolved in 50.5g of benzene lowered its freezing point by 0.40K. The freezing point depression constant of benzene is "5.12K.kg mol"^(-1) . Find the molecular mass of the solute.

What is the weight of 1 mole of a solute,0.132g of which in 29.7 g benzene gave a freezing point depression of 0.108^@C ? ( K_f for benzene = 5.12)

When 45 g of an unknown compound was dissolved in 500 g of water, the solution has freezing point of -0.93^(@)C (i) What is the molecular weight of compound ? (K_(f)=1.86) (ii) If empirical formula is CH_(2)O , what is the molecular formula of compound ?

When 250 mg of eugenol is added to 100 g of camphor (k_f = 39.7 k molality^(-1)) , it lowered the freezing point by 0.62^@C . The molar mass of eugenol is :

The depression in the freezing point of a benzene solution containing 0.784g of Acetic acid dissolved in 100ml of benzene is 0.35k. Calculate the van't Hoff factor and the degree of association of the solute at this concentration (k_(f)" for benzene = 5.10 k.kg.mol"^(-1)," molar mass of acetic acid is 60.01").

The fraction of phenol dimerised in benzene if 20 g of phenol in 1 kg benzene exhibits a freezing point depression of 0.69 K. ( K_f benzene) =5.12 kkg/mol),(MW of phenol=94)

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