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Vapour pressure of liquid solution

The vapour pressure of acetone at 20^{} {C} is 185 torr. When

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Solving time: 3 mins

The vapour pressure of acetone at $2 0^{\circ} C$ is 185 torr. When $1.2 g$ of a non-volatile substance was dissolved in $100 g$ of acetone at $2 0^{\circ} C$ , its vapour pressure was 183 torr. The molar mass $(g mol^{- 1})$ of the substance is

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Views: 6,336 students

Updated on: Jun 6, 2023

Book:

Arihant Chemistry JEE Main Chapterwise Solutions (2019-2002) (Arihant)

Exam:

JEE Mains 2015

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Daniel Discussed

The vapour pressure of acetone at

2 0^{\circ} C

is 185 torr. When

1.2 g

of a non-volatile substance was dissolved in

100 g

of acetone at

2 0^{\circ} C

, its vapour pressure was 183 torr. The molar mass

(g mol^{- 1})

of the substance is

11 mins ago

Discuss this question LIVE

11 mins ago

Text solutionVerified

Given,

p_{0} = 185

torr at

2 0^{\circ} C

p_{s} = 183

torr at

2 0^{\circ} C

Mass of non-volatile substance,

m = 1.2 g

Mass of acetone taken

= 100 g

M = ?

As, we have

\frac{p _{0} - p _{s}}{p _{s}} = \frac{n}{N}

Putting the values, we get,

\frac{185 - 183}{183} = \frac{\frac{1.2}{M}}{\frac{100}{58}} \Rightarrow \frac{2}{183} = \frac{1.2 \times 58}{100 \times M}

M = \frac{183 \times 1.2 \times 58}{2 \times 100}

M = 63.684 \approx 64 g / mol

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Question Text	The vapour pressure of acetone at $2 0^{\circ} C$ is 185 torr. When $1.2 g$ of a non-volatile substance was dissolved in $100 g$ of acetone at $2 0^{\circ} C$ , its vapour pressure was 183 torr. The molar mass $(g mol^{- 1})$ of the substance is
Updated On	Jun 6, 2023
Topic	Solutions
Subject	Chemistry
Class	Class 12
Answer Type	Text solution:1 Video solution: 4
Upvotes	427
Avg. Video Duration	11 min

The vapour pressure of acetone at $2 0^{\circ} C$ is 185 torr. When $1.2 g$ of a non-volatile substance was dissolved in $100 g$ of acetone at $2 0^{\circ} C$ , its vapour pressure was 183 torr. The molar mass $(g mol^{- 1})$ of the substance is

Text solutionVerified

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The vapour pressure of acetone at 20∘C is 185 torr. When 1.2 g of a non-volatile substance was dissolved in 100 g of acetone at 20∘C, its vapour pressure was 183 torr. The molar mass (gmol−1) of the substance is

Text solutionVerified

Filo tutor solutions (4)

Questions from JEE Mains 2015 - PYQs

Practice questions from Arihant Chemistry JEE Main Chapterwise Solutions (2019-2002) (Arihant)

Practice questions from Solutions in the same exam

Practice more questions from Solutions

Practice questions on similar concepts asked by Filo students

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The vapour pressure of acetone at $2 0^{\circ} C$ is 185 torr. When $1.2 g$ of a non-volatile substance was dissolved in $100 g$ of acetone at $2 0^{\circ} C$ , its vapour pressure was 183 torr. The molar mass $(g mol^{- 1})$ of the substance is