Section 1: Calculating the Number of Moles Present

If you know the mass of the component present and the RMM of the component, you can calculate the number of moles present.




How many moles of Potassium Chloride (RMM 74.56) are there in a solution containing 12 g of Potassium Chloride? Answer to 4 significant figures.

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There are 0.1609 moles of Potassium Chloride.
Number of Moles =      Mass of Component      
RMM
Moles of Potassium Chloride =     12    moles 74.56

Moles of Potassium Chloride = 0.16094 moles

Moles of Potassium Chloride = 0.1609 moles to 4 significant figures