[tex]\\ \tt\longmapsto No\:of\:moles=\dfrac{No\:of\:atoms}{Avagadro's\:no}[/tex]
[tex]\\ \tt\longmapsto No\:of\: moles=\dfrac{4.6\times 10^{23}}{6.022\times 10^{23}}[/tex]
[tex]\\ \tt\longmapsto No\:of\:moles=0.76=0.8mol[/tex]
Now
[tex]\\ \tt\longmapsto Given\:mass=No\:of\:moles(Molar\:mass)[/tex]
[tex]\\ \tt\longmapsto Given\:mass=0.8(284)[/tex]
[tex]\\ \tt\longmapsto Given\:mass=227.2g[/tex]
