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0.11 moles

Explanation:

The equation of the reaction is;

2SO2 + O2 >2SO3

Number of moles of O2 in 3.42 g = 3.42g/32 g/mol = 0.11 moles

Hence, 0.11 moles of O2 is consumed when 3.42 g of O2 reacts with SO2 to form SO3.

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