First, calculate the moles of \( \mathrm{Na}_{2} \mathrm{CO}_{3} \) by using its mass and molar mass. The formula to calculate moles is:
\[ \text{moles} = \frac{\text{mass (g)}}{\text{molar mass (g/mol)}} \]
Given that the mass of \( \mathrm{Na}_{2}
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