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An aqueous solution of 2% non-volatile s...

An aqueous solution of 2% non-volatile solute exerts a pressure of 1.004 bar at the normal boiling point of the solvent. What is the molar mass of the solute ?

Text Solution

Verified by Experts

Applying Raoult.s law of dilute solution
`(p^0 - p_s)/(p^0) = (n_2)/(n_1+n_2) = n_2/n_1 = (w_2// M_2)/(w_1//M_1)= w_2/M_2 xx M_1/w_1`
Substituting the values, we have
`((1.013 - 1.004)"bar")/(1.013 "bar") = (2g)/(M_2) xx (18 g "mol"^(-1))/(98 g)`
`M_2 = (2xx 18)/(98) xx (1.013)/(0.009) g "mol"^(-1) =41.g "mol"^(-1)`
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Knowledge Check

  • An aqueous solution of 2 per cent (wt.//wt) non-volatile solute exerts a pressure of 1.004 bar at the boiling point of the solvent. What is the molecular mass of the solute?

    A
    60.43 g
    B
    41.35 g
    C
    100.7 g
    D
    23.22 g

  • Choose the most appropriate options. Admission aglasem An aqueous solution of 2% (wt/wt) non volatile solute exerts a pressure of 1.004 bar at the boiling point of solvent. What is the remove acidic impurities in metallurgical molecular mass of the solute?

    A
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    B
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    C
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    D
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  • When non-volatile solute is assed to a pure solvent, the:

    A
    vapour pressure of the solution becomes lower than the vapour pressure of the pure solvent
    B
    rate of evaporation of solvent is reduced
    C
    solute does not affect the rate of condensation
    D
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