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cherrybhatnagar
Student
High School - 9th Grade

In chemistry 22.4litres of gas weighs 70g at S.T.P.Calculate weight of gas if occupies volume of 20litres at 27degree celsius and 700mmHg of pressure

it's a numerical of chemistry based on boyle's law and charles law.

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Posted by cherrybhatnagar on Tuesday June 30, 2009 at 6:44 PM and tagged with chemistry, science.

Answers:

  1. neela
    neela Teacher
    Graduate School

    eNotes Editor

    By gas law:

    PV= nRT, where P is pressure of the gas at the temperature T and R is a gas constant and n is the substance of gas in moles.

    Put values in the equation For STP and The given temprature and pressure situations.

    760d)(22.4)=(70/200.59)R(273.15)                (1)

    (700d)(20)=(x/200.59)R(273.15+27)               (2)

    (1)/(2) eleminates R and reduces To:

    760*22.4/(700*20) = (70/x)(273.15)/290.15

    x=70*273.15*700*20/(290.15*760*22.4)

    = 54.17 g

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    Posted by neela on Tuesday June 30, 2009 at 9:38 PM