<PRE><B>Question 955468</B>
The ratio by mass of sulfur dioxide to oxygen in a chemical reactor is 5:3. If the total mass of both compounds is 72 grams, what is the mass of oxygen. 
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5:3 is the same as 5x to 3x where oxygen = 3x
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Equation:
5x + 3x = 72 g
8x = 72
x = 9
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Ans: oxygen = 3x = 3*9 = 27 grams
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Cheers,
Stan H.
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