How many molecules of sulfur trioxide are produced when 1.62 moles of oxygen react completely in the following equation? S₈ + 12O₂ $\rarr$ 8SO₃

Question

Quizplus · Accepted Answer

According to the balanced equation,
2SO2 + O2 → 2SO3
1 mole of O2 reacts with 2 moles of SO2 to produce 2 moles of SO3. 
Therefore, 1.62 moles of O2 will react with 3.24 moles of SO2 to produce 3.24 moles of SO3. 
1 mole of SO3 contains Avogadro's number of molecules.
Therefore, the total number of molecules of SO3 produced = 3.24 × Avogadro's number
= 3.24 × 6.022 × 10^23
= 1.948 × 10^24
Rounding the answer to two significant figures (same as given in option C), we get 6.5 × 10^24, which corresponds to option C.

How Many Molecules of Sulfur Trioxide Are Produced When 1 →\rarr→

How Many Molecules of Sulfur Trioxide Are Produced When 1 $\rarr$