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General Chemistry

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Question
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The mass of oxygen in 96 grams of sulfur dioxide is closest to:

A 16 g
B 24 g
C 32 g
D 47 g
Ans. D The formula of sulfur dioxide is SO2. The formula weight of SO2 is 64 g/mol. This sample of SO2 contains 1.5 moles of it. If we calculate the percentage mass of the oxygen, we can see that the oxygen's mass contribution is 50% in SO2. So regardless of the amount of SO2 present, half of its mass is due to the presence of oxygen and the other half is due to the presence of sulfur. Here we have 96 g of SO2. Now, one half of 96 g gives 48 g.

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