According to the following reaction, how many moles of sulfur trioxide will be formed upon the complete reaction of 0.971 moles of sulfur dioxide with excess oxygen gas? sulfer dioxide (g) + oxygen (g) ->→ sulfer trioxide

1 Answer
anor277
Nov 6, 2016

Surely it will be 0.971*mol0.971⋅mol of SO_3SO3?

Explanation:

We need a stoichiometic equation:

SO_2(g) + 1/2O_2(g) rarr SO_3(g)SO2(g)+12O2(g)→SO3(g)

The equation unequivocally tells us that the reaction of 64*g64⋅g SO_2(g)SO2(g) with 16*g16⋅g O_2(g)O2(g) gives 80*g80⋅g SO_3(g)SO3(g). The given masses are the molar equivalents of each gas. Again, from the stoichometric equation, sulfur was the limiting reagent (because excess dioxygen gas was specified); there was a given molar quantity of sulfur (as its dioxide), and thus a given molar quantity of the trioxide.

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