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Question

10 moles of SO2 and 15 moles of O2 were passed over a catalyst to produce 8 moles of SO3. The ratio of moles of SO2 and SO3 in mixture is:

A
54
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B
14
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C
12
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D
34
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Solution

The correct option is B 14
Reaction is:
2SO2+O22SO3
Initial concentration of SO2=10 mol and O2=15 mol
At equillibrium, say x mol of O2 are consumed, therefore, 2x of SO3 will form as
2SO2102x+O215x2SO32x
Since moles of SO3 formed = 8 mol
2x=8 or x=4
[SO2][SO3]=1088=14
Therefore option B is correct.

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