How many total atoms are in 0.260 g of p2o5?

0.006 ×10²³  atoms

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

sodium (na), for example, has one electron in its valence shell. this is an unstable state because that valence shell needs eight electrons to be full. in order to fill its valence shell, find a way to add seven electrons to its valence shell