Two procedures are described.
1 Sulfur is burned in an excess of oxygen and then NO is added to the product mixture.
2 Sulfur is burned in an excess of oxygen and then $N{O_2}$ is added to the product mixture.
Which procedures will produce some sulfur trioxide, $S{O_3}$?
both 1 and 2
2 )
1 only
3 )
2 only
4 )
neither 1 nor 2
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