Answer: Option (b) is the correct answer.
Explanation:
According to the mole concept there are \(6.022 \times 10^{23}\) atoms present in 1 mole of a substance.
Mathematically, 1 mole = \(6.022 \times 10^{23}\) atoms or molecules
Therefore, number of atoms present in 0.05 moles of xenon are as follows.
\(0.05 \times 6.022 \times 10^{23}\)
= \(0.3011 \times 10^{23}\) atoms
or, = \(3.0 \times 10^{22}\) atoms
Thus, we can conclude that there are \(3.0 \times 10^{22}\) atoms present in 0.05 moles of xenon gas at STP.
