You can use information about reacting masses to calculate the formula of a compound.
Ex.
Suppose 3.2g of sulfur reacts with oxygen to produce 6.4g of sulfur oxide. What is the formula of the oxide?
Use the fact that the Ar of sulfur is 32 and the Ar of oxygen is 16.
stepactionSO 1 find masses 3.2 3.2 2 look up given Ar values 32 16 3 divide masses by Ar 0.1 0.2 4 find the ratio 1 2
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