RMS velocity of oxygen molecules at NTP is $0.5 \mathrm{~km} / \mathrm{s}$. The RMS velocity for the…
RMS velocity of oxygen molecules at NTP is $0.5 \mathrm{~km} / \mathrm{s}$. The RMS velocity for the hydrogen molecule at NTP is
- $4 \mathrm{~km} / \mathrm{s}$
- $2 \mathrm{~km} / \mathrm{s}$
- $3 \mathrm{~km} / \mathrm{s}$
- $1 \mathrm{~km} / \mathrm{s}$
Solution
RMS velocity of molecules at NTP
$v_{\mathrm{rms}}=\sqrt{\frac{3 R T}{M}}$
RMS velocity of oxygen molecules at NTP
$\left(v_1\right)=\sqrt{\frac{3 R T}{M_1}}=0.5 \mathrm{~km} / \mathrm{s}$
RMS velocity of hydrogen molecules at NTP
$\begin{aligned}
& \left(v_2\right)=\sqrt{\frac{3 R T}{M_2}} \\
& \therefore \quad \frac{v_1}{v_2}=\sqrt{\frac{M_2}{M_1}} \\
& \Rightarrow \quad \frac{0.5}{v_2}=\sqrt{\frac{2}{32}} \\
& \Rightarrow \quad \frac{0.5}{v_2}=\frac{1}{4} \\
& \Rightarrow \quad v_2=2 \mathrm{~km} / \mathrm{s} \\
&
\end{aligned}$
Asked in: MHT CET Full Test 9
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