Question

a. How many moles of sulfur trioxide, SO3, are present in a sample that contains 2.49 moles of oxygen atoms? mol SO, b. How many moles of oxygen atoms are present in a sample that contains 4.39 moles of SO3? mol

Answer 1

Part a

Moles of O = 2.49 mol

1 mol SO3 contains = 3 mol O

1 mol O = 1/3 mol SO3

2.49 mol O = 2.49/3 = 0.83 mol SO3

Part b

Moles of SO3 = 4.39 mol

1 mol SO3 = 3 mol O

4.39 mol SO3 = 3*4.39 = 13.17 mol O