Matter has the unique property of existing in different states at different temperatures and pressures. Solid, liquid and gas are the three states of matter.
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The average mass of a molecule of a substance is termed as its molecular mass (M). The molecular mass has the unit of mass, viz., gram, kilogram, atomic mass unit, etc.
A molecular formula is the shorthand notation of a substance. For example, carbon dioxide is written as CO2. The formula CO2 is much shorter than the name carbon dioxide.
The molecular formula of a compound is related to its empirical formula as follows: Molecular formula = n × Empirical formula, where, n may be 1, 2, 3 … thus the value of n can be obtained by the following relationship.