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NTA Abhyas 2020
Exam
NTA Abhyas
Year
2020
Subject
Chemistry
Chapter
States of Matter

NTA Abhyas 2020 · Chemistry · States of Matter

A flask containing air (open to the atmosphere) is heated from 300K...

A flask containing air (open to the atmosphere) is heated from 300K to 500K. Then % of air escaped to the atmosphere is

Correct answer

40

Step-by-step solution

P1V1=n1RT1{P}_{1}{V}_{1} = {n}_{1}R{T}_{1}
P1V1=n2RT2{P}_{1}{V}_{1} = {n}_{2}R{T}_{2}
So n1RT1=n2RT2{n}_{1}R{T}_{1} = {n}_{2}R{T}_{2} (P of V are constant)
n1T1=n2T2{n}_{1}{T}_{1} = {n}_{2}{T}_{2} ,
n1300=n2500{n}_{1}300 = {n}_{2}500
n2=35n1{n}_{2} = \dfrac{3}{5}{n}_{1}
No. of moles escaped =n1−35n1=25n1= {n}_{1} - \dfrac{3}{5}{n}_{1} = \dfrac{2}{5}{n}_{1}
% escaped =25×100=40= \dfrac{2}{5} \times 100 = 40%
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