Question

What weight of hydrogen at STP could be contained in a vessel that holds 4.8 g oxygen at STP?

• A. 4.8 g
• B. 3.0 g
• C. 0.6 g
• D. 0.3 g

Answer 1

The correct option is D 0.3 g

According to Avogadro's law, equal volume of all gases under similar conditions of temperature and pressure contain equal number of molecules.

No. of molecules of $H_2=$ No. of molecules of $O_2$

$\frac{w\times N}{2}=\frac{4.8\times N}{32}$

where N = Avogadro's number ($6.02\times {10}^{23}$) and $\omega =$ mass of $H_2$ (in g)

∴ $\omega =\frac{4.8\times 2}{32}=0.3g$

Hence, the correct answer is option $\text{D}$.