Answer to Question #347548 in General Chemistry for frank

Question

ulfur trioxide (SO3) is produced from the oxidation of SO2 as follows:

2 SO2 + O2 → 2 SO3

A 23-g sample of SO2 gives 18 g of SO3. Calculate the percent yield of sulfur trioxide, SO3.

A. 10 %

Answer 1

m(SO₃) = (m(SO₂)*2Mr(SO₃)) / 2Mr(SO₂)

m(SO₃) = (23 g * 2*80 g/mol) / 2*64 g/mol = 28.75 g

percent yield  = (18 g / 28.75 g) * 100% = 62.62 %