How many total atoms are in 0.45 gm of p2o5

0.45 grams of P₂O₅

To find the total molecules, we first need to find the moles of P₂O₅ and then use Avogardo's constant to find the number of molecules.

To convert to moles, we first need to use the molar mass.
The molar mass of P₂O₅ is (2*30.98)+(5*16.00) = 141.96
You can find the molar mass using the periodic table.

0.45 grams * (1 mole/141.96 grams) = 0.0031699 moles

Now we multiply by Avogadro's constant to convert to moles.
0.0031699 moles * (6.022*10^23 atoms/1 mole) = 1.9*10^21 molecules

Since 0.45 has 2 significant figures, our final answer is also limited to 2 significant digits.

Your final answer is 1.9*10^21 molecules.