Explanation:
According to the mole concept, there are [tex]6.022 \times 10^{22}[/tex] atoms present.
It is given that mass is 0.250 g. And, number of moles are equal to mass divided by molar mass.
Mathematically, No. of moles = [tex]\frac{mass}{\text{molar mass}}[/tex]
As molar mass of [tex]P_{2}O_{5}[/tex] is 283.88 g/mol. Therefore, putting given values into the above formula as follows.
No. of moles = [tex]\frac{mass}{\text{molar mass}}[/tex]
= [tex]\frac{0.250 g}{283.88 g/mol}[/tex]
= 0.0008 mol
Hence, number of atoms present in 0.0008 mol are as follows.
[tex]0.0008 mol \times 6.022 \times 10^{22} atoms/mol[/tex]
= 0.0048 atoms
Thus, we can conclude that there are 0.0048 atoms in 0.250 g of [tex]P_{2}O_{5}[/tex].
