The mole and the Avogadro constant

Question 1

What is Avogadro’s constant?

Answer 1

The Avogadro’s constant or Avogadro number is the number of atoms in 12g of carbon - 12

Question 2

What is the mole?

Answer 2

The mole is an amount of substance that contains 6.022 x 10 to the power of 23 particles

Question 3

You have 5.3 grams of Na2CO3, how many moles are there?

Answer 3

Number of moles = mass ÷ mass of one mole

Number of moles = 5.3 ÷ (23 x 2) + 12 + (16x3)

Number of moles = 5.3 ÷ (46 + 12 + 48)

Number of moles = 0.05

Question 3

How do you calculate the number of moles present?

Answer 3

Number of moles = mass ÷ mass of one mole