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Kiran Sagar
Asked: 2022-11-10T23:41:18+05:30 In:

The vapour pressure of water at `20^(@)C is 17.54mm`. When 20g of non – ionic substance is dissolved in 100g of water, the vapour pressure is lowered by `0.30mm`. What is the molecular mass of the substance ?
A. `200.8`
B. `206.88`
C. `210.5`
D. `215.2`

The vapour pressure of water at `20^(@)C is 17.54mm`. When 20g of non – ionic substance is dissolved in 100g of water, the vapour pressure is lowered by `0.30mm`. What is the molecular mass of the substance ?
A. `200.8`
B. `206.88`
C. `210.5`
D. `215.2`
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  1. Correct Answer – B
    Relative lowering in vapour pressure,
    `(p^(@)-p_s)/(p^(@))=(x_(2))/(x_(2)+x_(1))=(w//m)/(w/m+W/M)`
    `(0.30mm)/(17.54mm)=(20//m)/(20//m+100//18)`
    `rArrm=206.88`

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