For the following: 1. Draw a circle around each subscript. 2. Draw a square around each coefficient. H2O 5Cl2 2Mg 3H2O2 For the following 1. List the chemical symbols of each element. 2. Give the number of atoms of each element. HCI CO2 NazSO4 Balance the following chemical equations. 1. Cu20 + Cu + CO2 2. H2O2 H2O + O2 3. Al + Fe:N2 → AIN + Fe

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Mole Concept

Mole concept is a method to determine the amount of any substance that consists of some elemental particles using a grouping unit called ‘mole’. The mole concept enables one to handle the large amount of small elementary particles. The mole concept can be used in many calculations related to mole calculation, molar amount, mole ratio, and so on, which are significant in chemistry.