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An open-end manometer was used to determ...

An open-end manometer was used to determine the pressure of a gas present in a container. It was found that the height of mercury level in the arm attached to the gas-filled container was 4 cm higher than that in the open ene arm. If the atmospheric pressure was measured to be 76 cm Hg, then what will be the pressure of the gas inside the container in atm unit?

Text Solution

Verified by Experts

As the height of the mercury level in the arm attached to the container is higher than that in the open-end atm,
`P_(gas)=P_(atm)-h`
Putting `h=4.0cm,P_(atm)=76cm" Hg into this relation gives"`.
`P_(gas)=P_(atm)-h=(76-4.0)cm` Hg=72 cm Hg
thus, the pressure of gas inside the container
`=72cm" Hg"=(72" cm Hg")/("76 cm Hg")xx1atm=0.94atm`
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