Answer:
0.006 ×10²³ atoms
Step-by-step explanation:
Given data:
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