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Question

When a mixture containing 10 moles of SO2 and 15 moles of O2 is passed over catalyst, 8 moles of SO3 is formed. How many moles of SO2 and O2 did not enter into combination respectively?

A
2, 11
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B
4, 22
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C
11, 2
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D
22, 4
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Solution

The correct option is A 2, 11
2SO2+O22SO3
2 moles of SO2 will react with 1 mole of O2 to form 4 moles of SO3.
8 moles of SO2 will react with 4 moles of O2 to form 8 moles of SO3.
Hence, 108=2 moles of SO2 and 154=11 moles of O2 did not enter into the combination respectively.

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