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Fill in the blanks. ltbRgt a. The mass o...

Fill in the blanks. ltbRgt a. The mass of `MgCL_(2)` should be dissolved in `750 g` of water in order to prepare a `1.05 m` solution is……
b. The percentage composition (by mass) and mole fraction of each component is sugar containing `1000 g` of sugar in `2000 g` of water is.........

Text Solution

Verified by Experts

The correct Answer is:
A, B, C, D
a. `m = (W_(2) xx 1000)/(Mw_(2) xx W_(1))`
`1.05 = (W_(2) xx 1000)/(95 xx 750)` `:. W_(2) = 74.8 g`
b. `[Mw (C_(12) H_(22) O_(11)) = 342 g]`
% of sugar `= (W_(2))/(W_(1) + W_(2)) xx 1000 = ((1000)/(1000 + 2000)) xx 1000`
% of `H_(2) O = ((W_(1))/(W_(1) + W_(2))) xx = ((2000)/(3000)) xx 1000`
`= 200//3`
`chi_(1) (H_(2) O) = (2000//18)/((2000)/(18) + (1000)/(342)) = (111.11)/(111.11 + 2.92)`
`= (111.11)/(114.03) = 0.97`
`chi_(2)` (sugar) `= 1 - 0.97 = 0.03`
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Knowledge Check

  • The mole fraction of NaCl in a solution containing 1 mole of NaCl in 1000 g of water is

    A
    `0.0177`
    B
    `0.001`
    C
    `0.5`
    D
    `0.244`

  • The mole fraction of water in a solution containing 50g of water and 50g of ethyl alcohol is :

    A
    `(C_(6)H_(5)CH_(3))`
    B
    `18/(18+46)`
    C
    `1.09/(1.09+2.78)`
    D
    `2.78/(1.09+2.78)`

  • Mole fraction of sugar, if 34.2 g of sugar is dissolved in 180 g of water is

    A
    `0.0099`
    B
    `0.099`
    C
    `0.99`
    D
    `9.90`

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