Moles Formula for calculations

How to use Moles Formula for calculations for a substance?

Practice questions/worksheet

Use the following Moles Formula

Mole(n)= Mass of a substance(m)/ Molar mass(Mr)

so moles of a substance , n= m / Mr

The first question is solved for you.

For calculating Molar mass, you need to add the relative atomic masses of all the atoms in a 

compound or ion. For example Mr of Na₂O = (23×2)+16 = 62 ,

because  Ar( relative atomic mass) of Na=23,

Ar( relative atomic mass) of O= 16

so  moles of 100 g Na₂O= 100/ 62= 1.61 moles

Use of Moles Formula

Calculate number of moles in 50 g of Na₂O

Calculate number of moles in 100 g of H₂O

Calculate number of moles in 25 g of NaOH

Calculate number of moles in 75 g of MgO

Calculate number of moles in 65 g of Mg(OH)₂

Calculate number of moles in 15 g of Li₂O

Calculate number of moles in 85 g of HCl

Calculate number of moles in 33 g of LiCl

Calculate number of moles in 48 g of MgCl₂

Calculate number of moles in 77 g of P₄O₁₀

Calculate number of moles in 43 g of H₃PO₄

Calculate number of moles in 94 g of Cl₂O₇

Calculate number of moles in 69 g of HClO₄

Calculate number of moles in 86 g of SO₂

Calculate number of moles in 39 g of H₂SO₃

Calculate number of moles in 68 g of SiO₂

Calculate number of moles in 74 g of Al₂O₃

Calculate number of moles in 116 g of H₂SO₄

Calculate number of moles in 5k g of Al₂(SO₄)₃

Calculate number of moles in 2.5 g of CO

Calculate number of moles in 10 g of NO

 Calculate number of moles in 88 g of CO₂

Calculate number of moles in 56 g of N₂

Calculate number of moles in 235 g of NH₄

Calculate number of moles in 64 g of F₂

Calculate number of moles in 45 g of Sucrose?

Calculate number of moles in 99 g of Fe

Calculate number of moles in 235 g of NH_3.

Read Moles to grams

Hope you can use Moles Formula for calculations.