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What is the rms speed of Helium gas mole...

What is the rms speed of Helium gas molecules at STP.

Text Solution

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`V_(rms)` is given by
`V_(rms)=sqrt((3RT)/(M_W))`
At STP, T=273 K, `M_W` = 4 `gm//mol=0.004 kg//mol`,
`R=8.31 J//mol-K`.
`V_(rms)=sqrt((3xx8.31xx273)/(.004))=sqrt(1.7xx10^6)=1.3xx10^3 m//s`
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