Potassium chlorate decomposes to produce 20 g of solid potassium chloride. Oxygen gas is also produced. Which best describes the mass of oxygen?
A. It is more than the mass of potassium chloride.
B. It is less than the mass of potassium chlorate.
C. It equals the mass of potassium chlorate.
D. It equals the mass of potassium chloride.
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