Simple Description

The relative formula mass, Mr, is the mass of one mole of a substance (in grams)

Further Detail

The relative formula mass of a substance is the mass (in grams) that one mole of that substance would be. For example, carbon has a relative formula mass of 12 and therefore 1 mole of carbon would have a mass of 12 grams. The abbreviation for relative formula mass is Mr.

Related Words:

• Mole
• Mr
• Relative atomic mass

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