The molar mass $M$ is given by the sum of the atomic masses of all the atoms in the molecule. For $\mathrm{Na}_{2} \mathrm{CO}_{3}$, this is $2 \times \text{atomic mass of Na} + \text{atomic mass of C} + 3 \times \text{atomic mass of O} = 2 \times 23 \,
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