The vapour pressure of a solution of 5g of non-electrolyte in 100g of water at a particular temperature is `2985 N m^(-2)`. The vapour pressure of pur

Question

The vapour pressure of a solution of 5g of non-electrolyte in 100g of water at a particular temperature is `2985 N m^(-2)`. The vapour pressure of pur

The vapour pressure of a solution of 5g of non-electrolyte in 100g of water at a particular temperature is `2985 N m^(-2)`. The vapour pressure of pure water at that temperature is `3000 N m^(-2)`. The molecular weight of the solute is
A. 180
B. 90
C. 270
D. 200

Monjur Alahi

8 views

2025-01-04 04:42

1 Answers

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Salim Ahmed Kawsar · Accepted Answer · 2023-02-05T15:29:48+06:00

Salim Ahmed Kawsar

Correct Answer - A
`(p_(1)^(@)-P)/P_(1)^(@)=(W_(2)//M_(2))/(W_(1)//M_(1)+W_(2)//M_(2))`
`=(34.2//342)/(34.2//342+180//18)=0.1/10.1=0.0099`
i.e., ` (3000-2985)/3000=(15//M_(2))/(100//18) or M_(2) =180`

8 views Answered 2023-02-05 15:29