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12 ~g of a nonvolatile solute dissolved in 108 ~g of water produces the relative lowering of vapour pressure of 0.1 . The molecular mass of the solute is :

Options

  1. A80
  2. B60
  3. C20
  4. D40

Correct answer

C. 20

Step-by-step solution

P ^ o - P _s P ^ o = n N = w m M W 0.1= 12 m 18 108 m= 12 18 0.1 108 =20

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