Law of Conservation of Mass

Confirm a balanced reaction by checking that total reactant mass equals total product mass.

$$\sum m_{\text{reactants}}=\sum m_{\text{products}}$$

Variables

Symbol	Meaning	Unit
$m_{\text{reactants}}$	Mass of each reactant	g
$m_{\text{products}}$	Mass of each product	g

Worked example

5 grams of chlorine plus 3.24 grams of sodium equals 8.24 grams of sodium chloride. Reactant mass equals product mass.

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Part of The Blueprint of Water