Calculate the mass of sodium carbonate $$\(\left(\mathrm{Na}_{2} \mathrm{CO}_{3}\right)\)$$ required to make up $$\(250 \mathrm{~cm}^{3}\)$$ of a $$\(0.100 \mathrm{~mol} \mathrm{dm}^{-3}\)$$ solution. [ $$\(A_{\mathrm{r}}\)$$ values: $$\(\quad \mathrm{C}=12.0 \quad \mathrm{O}=16.0 \quad \mathrm{Na}=23.0\)$$ ]

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