Calculate the weight of non-volatile solute having molecular weight 40, which should be dissolved in 57 gm octane to reduce its vapour pressure to 800%:

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47.2 g

5 g

106.2 g

None of these

answer is B.

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Detailed Solution

Ps=80100P∘,w=?Msolute =40,w=114g,Msolvent =114∵P∘−PsPs=W×Msolvent Msolute ×Wor p∘−(80/100)P∘(80/100)P∘=w×11440×57;∴ w=5g

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