The Mole and Equations

## The mass of one mole of a substance is equal to:

the

**relative atomic mass**(*A*r) of its formula in grams if the substance is an**element**the

**relative formula mass**(*M*r) of its formula in grams if the substance is a**compound**

## You can use moles to calculate masses in reactions

Remember those balanced equations, well the big numbers in front of the chemical formulas of the

**reactants**and**products**tell you how many moles of each substance takes part or is formed during the reaction

## You can balance equations using reacting masses

If you know the masses of the reactants and products that took part in a reaction, you can work out the

**balanced**symbol equation for the reactionDivide them mass of each substance by its relative formula mass to find the number of moles

Divide the number of moles of each substance by the smallest number of moles in the reaction

If any of the numbers aren’t whole numbers, multiply all the numbers by the same amount so that they all become whole numbers

Write the balanced symbol equation for the reaction by putting these numbers in front of the chemical

**formulas**

# The Mole and Equations

## The mass of one mole of a substance is equal to:

the

**relative atomic mass**(*A*r) of its formula in grams if the substance is an**element**the

**relative formula mass**(*M*r) of its formula in grams if the substance is a**compound**

## You can use moles to calculate masses in reactions

Remember those balanced equations, well the big numbers in front of the chemical formulas of the

**reactants**and**products**tell you how many moles of each substance takes part or is formed during the reaction

## You can balance equations using reacting masses

If you know the masses of the reactants and products that took part in a reaction, you can work out the

**balanced**symbol equation for the reactionDivide them mass of each substance by its relative formula mass to find the number of moles

Divide the number of moles of each substance by the smallest number of moles in the reaction

If any of the numbers aren’t whole numbers, multiply all the numbers by the same amount so that they all become whole numbers

Write the balanced symbol equation for the reaction by putting these numbers in front of the chemical

**formulas**