The Mole and Chemical Equations
Chemical equations can be used to calculate masses of REACTANTS and PRODUCTS.
There are a few steps to follow to carry out these calculations.
First identify the KNOWN and UNKNOWN substances.
The KNOWN substance is the substance you know the mass of.
The UNKNOWN substance is the substance you need to find out.
Step 1:
Find the MOLES of the KNOWN substance. You can do this by DIVIDING the mass by the Mr of the KNOWN substance.
Step 2:
Here you need to look at the BIG numbers in front of the substances in the BALANCED equation.
You need to use the number IN FRONT of the KNOWN and UNKOWN to write the RATIO of them.
Known : Unknown
Use this ratio to find the MOLES of the UNKNOWN.
Step 3:
Find the mass by MULTIPLYING the MOLES of the UNKNOWN by its Mr.
Let's go through the steps using an example:
