a Carbon monoxide is 43% carbon by mass; nitrous oxide is 30% nitrogen by mass. For both gases, the remainder is oxygen. In a mixture containing 5g of each gas, what is the mass of oxygen present?
b A 5g sample of carbon monoxide is mixed with 4g of nitrous oxide and 3 g of sulfur dioxide. Sulfur dioxide is 50% sulfur by mass, the balance is oxygen. What is the percentage by mass of oxygen and of sulfur present in the mixture? Use the mass compositions given in part a.
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