Discussion
Maximum number of molecules are present in :
Answer: D
The maximum number of molecules is in 1.0 mol of O2 gas.
Compare the amounts in moles, taking 22.4 L per mole at STP:
\[ \begin{aligned} 15\ \mathrm{L\ H_{2}} &= 15/22.4 = 0.67\ \mathrm{mol} \\ 10\ \mathrm{L\ O_{2}} &= 10/22.4 = 0.45\ \mathrm{mol} \\ 0.5\ \mathrm{g\ H_{2}} &= 0.5/2 = 0.25\ \mathrm{mol} \\ \mathrm{O_{2}} &= 1.0\ \mathrm{mol} \end{aligned} \]
The number of molecules is proportional to moles, so 1.0 mol, 6.02 × 1023 molecules, is the largest. Hydrogen's low molar mass does not help when only 0.5 g is taken.
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