How many total atoms are in 0.930 g of P2O5?

Molar mass P2O5 = 31 x 2 + 16 x 5 => 142 g/mol

142 g 6.02 x 10²³ molecules

0.930g g ( molecules )

molecules = 0.920 x ( 6.02 x 10²³ ) / 142

molecules = 5.53 x 10²³ / 142

= 3.89 x 10²¹ molecules

1 molecule P2O5 7 atoms

3.89 x 10²¹ molecules ( atoms )

atoms = ( 3.89 x 10²¹) x 7 / 1

atoms = 2.72 x 10²² atoms of P2O5

periodic trends is an atom that gets larger as the number of electronic shells increase, the radius of atoms increases as you go down a certain group in the periodic table of elements. in general, the size of an atom will decrease as you move from left to right of a certain period.