Question

Calculate the number of atoms of Na in 0.25 mole in sodium oxide

Answer 1

The number of atoms in one mole is equal to Avogadro's number 6.023*10²³atoms

What about 0.1855 moles

How we got 0.1855 moles

• Na₂O has a molecular mass of 62.
• Na in Na₂O has a mass of 46
• 46/62*0.25 gives 0.1855 moles

0.1855* 6.023*10²³ to get 1.1171*10²³ atoms