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Hydrochloric acid is treated with a meta...

Hydrochloric acid is treated with a metal to produce hydrogen gas. Suppose a student carries out this reaction and collects a volume of `154.4xx10^(-3)dm^(3)` of a gas at a pressure of 742 mm of Hg at a temperature of 298 K. What mass of hydrogon gas (in mg) did the student collect?

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Verified by Experts

Given,
`V=154.4xx10^(-3)dm^(3)`,
P=742mm of Hg
T=298K m=?
`n=(PV)/(RT)=(742" mmHg "xx154.4xx10^(-3)L)/(62" mmHg "LK^(-1)mol^(-1)xx298K)`
`n=("Mass")/("Molar mass")`
mass=n `xx` Molar mass
`=0.006xx2.016`
`=0.0121g=12.1mg`.
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