202- If a mixture of magnesium and calcium oxides, with purities of 80\% and 60\% by mass respectively, reacts with 88 g of carbon dioxide gas, and 40\% of the carbon dioxide reacts with magnesium oxide and 30\% reacts with calcium oxide, how many grams of solid remain? What is the total mass percentage of the complete and incomplete reactions of the oxides with gas? (Assume gas does not react with solid metals.) The molar masses of the metals are: $C = 12,\ O = 16,\ Mg = 24,\ Ca = 40\ \text{g.mol}^{-1}$ $$\text{(1)}\ 46 \qquad \text{(2)}\ 65 \qquad \text{(3)}\ 78 \qquad \text{(4)}\ 87$$
\textbf{202-} If a mixture of magnesium and calcium oxides, with purities of 80\% and 60\% by mass respectively, reacts with 88 g of carbon dioxide gas, and 40\% of the carbon dioxide reacts with magnesium oxide and 30\% reacts with calcium oxide, how many grams of solid remain? What is the total mass percentage of the complete and incomplete reactions of the oxides with gas? (Assume gas does not react with solid metals.) The molar masses of the metals are: $C = 12,\ O = 16,\ Mg = 24,\ Ca = 40\ \text{g.mol}^{-1}$
$$\text{(1)}\ 46 \qquad \text{(2)}\ 65 \qquad \text{(3)}\ 78 \qquad \text{(4)}\ 87$$