How many total atoms are in 0.260 g of P2O5?

0.006 * 10²³ atoms

Explanation:

Given dа ta:

Mass of P₂O₅ = 0.260 g

Number of atoms = ?

Solution:

To solve this problem we will use the Avogadro numbers.

The number 6.022*10²³ is called Avogadro number and it is the number of atoms, ions or molecules in one mole of substance. According to this,

1.008 g of hydrogen = 1 mole = 6.022*10²³ atoms.

18 g water = 1 mole = 6.022*10²³ molecules

Thus,

283.88 g of P₂O₅ = 1 mole = 6.022*10²³ atoms.

For 0.260 g:

0.260 g / 283.88 g/mol = 0.00092 mol

0.00092 * 6.022*10²³ atoms = 0.006 * 10²³ atoms