Answer:
2.2 x 10²² molecules.
Step-by-step explanation:
- Firstly, we need to calculate the no. of moles in (6.0 g) sodium phosphate:
no. of moles = mass/molar mass = (6.0 g)/(163.94 g/mol) = 0.0366 mol.
- It is known that every mole of a molecule contains Avogadro's number (6.022 x 10²³) of molecules.
using cross multiplication:
1.0 mole of sodium phosphate contains → 6.022 x 10²³ molecules.
0.0366 mole of sodium phosphate contains → ??? molecules.
∴ The no. of molecules in 6.0 g of sodium phosphate = (6.022 x 10²³ molecules)(0.0366 mole)/(1.0 mole) = 2.2 x 10²² molecules.