What is the relative formula mass of CaCO3?

The relative formula mass (RFM) is simply just a sum of the atomic masses that make up the compound in question.

Ca = 40

C = 12

O = 16

RFM of CaCO3 = 40 + 12 + (16 x 3) = 100

Note we have three oxygens so we need to multiply the atomic mass by three before adding the mass of calcium and carbon.

JH
Answered by Joshua H. Chemistry tutor

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