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A cylinder contains hydrogen gas at pressure of and temperature . Its density is:
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For an ideal gas sample
\(\begin{aligned}
& \frac{\mathrm{P}}{\rho}=\frac{\mathrm{RT}}{\mathrm{MW}} \\
& \rho=\frac{\mathrm{PMW}}{\mathrm{RT}}=\frac{249 \times 10^3 \times 2 \times 10^{-3}}{8.314 \times 300}=0.199 \\
& \rho=0.2 \mathrm{~kg} / \mathrm{m}^3
\end{aligned}\)
\(\begin{aligned}
& \frac{\mathrm{P}}{\rho}=\frac{\mathrm{RT}}{\mathrm{MW}} \\
& \rho=\frac{\mathrm{PMW}}{\mathrm{RT}}=\frac{249 \times 10^3 \times 2 \times 10^{-3}}{8.314 \times 300}=0.199 \\
& \rho=0.2 \mathrm{~kg} / \mathrm{m}^3
\end{aligned}\)
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