## Related questions with answers

Question

Which gas effuses faster, He or Ar, and how much faster does it effuse?
(a) He effuses 9.98 times as fast as Ar.
(b) He effuses 3.16 times as fast as Ar.
(c) Ar effuses 9.98 times as fast as He.

(d) Ar effuses 3.16 times as fast as He.
(e) He and Ar effuse at the same rate.

Solution

VerifiedStep 1

1 of 3Determine the molar mass for $\mathrm{He}$.

$\begin{align*} \mathcal{M}_{He}&= 4.0026\;\mathrm{g/mol} \end{align*}$

Determine the molar mass for $\mathrm{Ar}$.

$\begin{align*} \mathcal{M}_{Ar} &= 39.948\;\mathrm{g/mol} \end{align*}$

He has a lower molar mass than Ar, so He effuses faster.

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