The balanced equation for a reaction shows how many moles of each reactant and product are involved in a chemical reaction.
If the amount, in moles, of one of the reactants or products is known, the number of moles of any other reactants or products can be calculated.
The number of moles (n), the mass of the substance (m), and the molar mass (M) are linked by:
n = m/M
Note: The molar mass of a substance is the mass per mole of the substance. For CaCO3, for example, the atomic mass of calcium is 40.1, carbon is 12, and oxygen is 16. So the molar mass of CaCO3 is:
40.1 + 12 + (16 x 3) = 100.1 (The units are g mol-1).
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