What is the density of hydrogen at STP conditions?

0.1 g / L

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0.2 g / L

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0.09 g / L

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2 g / L

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Solution

The correct option is D $0.09 g / L$
we know,

$P V = \frac{m}{M} \times R \times T$

At STP, $P = 1$ atm
$T = 273.15$ K

$1 \times V = \frac{m}{2} \times 0.0821 \times 273.15$

Density $= ρ = \frac{m}{V} = \frac{2}{0.0821 \times 273.15}$

$ρ = 0.09 g / L$

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