A $18\mathrm{.}3$ g sample of a mixture of magnesium carbonate and calcium carbonate is treated with excess HCl$.$ The resulting reaction produces $6\mathrm{.}03$ L of carbon dioxide gas at $28\backslash$deg C and $643$ torr.

Write a balanced chemical equation for the reaction that takes place between magnesium carbonate and HCl$.$ Include physical states.

chemical reaction: $\_\_\_\_\_\_\_\_\_\_\_$

Write a balanced chemical equation for the reaction that takes place between calcium carbonate and HCl$.$ Include physical states.

chemical reaction: $\_\_\_\_\_\_\_\_\_\_$

Calculate the total number of moles of carbon dioxide that forms from these reactions.

moles of carbon dioxide: $\_\_\_\_\_\_\_\_\_\_\_$

Assuming the reactions are complete, calculate the precentage by mass of magnesium carbonate and calcium carbonate in the mixture.

magnesium carbonate: $\_\_\_\_\_\_\_\_\%$

calcium carbonate: $\_\_\_\_\_\_\_\_\_\_\%$