Essential Chemistry for IGCSE - Formulae And Equations (Section 4 - No. 20)
What is the role of the numbers in the front of the chemical formula, for example, 2H2O?
To tell how many molecules are present.
To tell how many atoms are present.
To give the number of electrons.
To balance the atoms of each compound.
Explanation
These numbers indicate the number of molecules or formula units of a particular substance involved in the reaction.
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