The equation shows the thermal decomposition of magnesium carbonate. $$\[ \mathrm{MgCO}_{3} \rightarrow \mathrm{MgO}+\mathrm{CO}_{2} \]$$ [ $$\(M_{\mathrm{r}}: \mathrm{MgCO}_{3}, 84\)$$ ] Which mass of magnesium oxide is formed when 21.0 g of magnesium carbonate is completely decomposed?

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