Chemistry - C3 Notes

Moles and Equations

• To find the relative formula mass of a substance, add together the relative atomic masses of the atoms MgCl2 - Mg = 24 Cl=35.5   Mg + (Cl x 2) = 24 + (35.5 x 2) = 95
• The value of the Avogadro constant is 6.02 x 10^2
• The formula that relates the number of moles of a substance to its mass and Mr is number of moles = mass (of an element/compound) in g / Mr (of…