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