How many total atoms are in 0.670 g of p2o5?

The molecular formula for compound is   mass of compound is 0.670 g.

To calculate number of atoms first calculate number of moles in the compound as follows:

Molar mass of   is 283.886 g/mol, thus,

Thus, number of mole of is 0.00236 mol.

From the molecular formula 1 mole of has 2 mol of P (phosphorus) and 5 mol of O (oxygen).

Thus, number of moles of P and O in 0.00236 mol of will be:

Similarly,

Now, in 1 mol of an element there are atoms.

Number of atoms of P will be:

Similarly, number of atoms of O will be:

Total number of atoms will be sum of number of atoms of P and O:

Therefore, total number of atoms in will be .