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A solution containing 1.8g of a compound...

A solution containing 1.8g of a compound in 40 g of water is observed to freeze at `-0.465^@C`. The molecular formulas of the compound is `(K_f of water=1.86 Kg Kmol^-1)`

A

`C_2H_4O_2`

B

`C_3H_6O_3`

C

`C_4H_8O_4`

D

`C_5H_10O_5`

Text Solution

Verified by Experts

The correct Answer is:
`C_6H_12O_6`
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A solution containing 1.8 g of a compound (empirical formula CH_(2)O ) in 40 g of water is observed to freeze at -0.465^(@) C. The molecules formulea of the compound is ( K_(f) of water =1.86kg K mol^(-1) ):

15 g of an unknown molecular substance was dissolved in 450 g of water. The resulting solution freezes at - 0 . 34^(@) C . What is them molar ass of the substance ? ( K_(f) for water = 1. 86 K kg mol^(-1) )

The freezing point of a solution containing 0.3 g of acetic acid in 30.0 g of benzene is lowered by 0.45^@ . Calculate the Van's Hoff factor. (K_f for benzene=5.12K kg mol^-1) .

When 36.0 g of a solute having the empirical formula CH_(2)O is dissovled in 1.20 kg of water, the solution freezes at -0.93^(@)C . What is the moleculer formula of the solute ? ( K_(f) = 1.86^(@)C kg mol^(-1) )

Ethylene glycol (molar mass = 62gmol^-1) is a common automobile antifreeze. Calculate the freezing point of a solution containing 12.4 g of this substance in 100 g of water. Would it be advisable to keep this substance in car radiator during summer? (K_f for water=1.86Km^-1 and K_b for water=0.512Km^-1) .

The empirical formula of a non-electrolyte is CH_(2)O . A solution containing 3 g L^(-1) of the compound exerts the same osmotic pressure as that of 0.05 M glucose solution. The molecules formula of the compound is :

A solution of 1 . 25 g of non eletrolyute solute in 20 g of water freezes at 271 . 94 K. Calculate the molecular mass of solute. The molal depression constant for water is K_(f) = 1 . 86 K//m

The freezing point of solution containing 0.2 g of acetic acid in 20.0 g of benzene is lowered by 0.45^(@)C . Calculate the degree of association of acetic acid in benzene. (K_(f)=5.12 K^(@) mol^(-1) kg^(-1))

A solution of 1.25 g of P in 50 g of water lowers freezing point by 0.3K . Molar mass of P is 94 and k_f(water)=1.86K kg mol^-1) . The degree of association of P if it forms dimers in water is

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