GCE O Level Chemistry : Calculation From equations through Moles

Moles Calculation From Equations

Balanced Chemical Equations can be used to Calculate the amount of reactants and Products.

The Simplest Example is of Water. 2H2+O2=2H2O

The equation Shows That there are 2 Moles of Hydrogen Molecule are reacting with 1 Mole of Oxygen Molecule. The number before the symbol of Hydrogen tells How many moles are involved in the reaction. 1 Mole of Hydrogen Molecule is equal to 2g. If you do not know how we Find That Out Study the Post Stoichiometry and The Mole Concept By Clicking Here

Similarly 1 Mole of Oxygen Molecule is equal to 32g. This means that a total of 4g of Hydrogen (as 2 moles of Hydrogen are involved in the reaction) and 32g of Oxygen are involved in the reaction. The reaction produces 2 Moles of Water and this means that total mass of  water produced is 36g.

Now a Question can be prepared that how many grams of water are produced when 0.2 Moles of hydrogen are burnt in excess Oxygen.

Solution

2 Moles Of Hydrogen Produce 2 Moles of Water.

This means that 1 Mole of Hydrogen will produce 1 Mole of Water.

and 0.1 Mole Of Hydrogen will produce 0.1 Mole Of water.

1 Mole of water is equal to 36 g 

0.1 mole of water is equal to 0.1 multiplied by 36 = 3.6g

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