How many total of atoms are in 0.370gr of p2o5

142 g 6.02 x 10²³ molecules
0.920g 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

 Hope this helps!!!

If your on odysseyware i believe the answer would be c.