Question

If 4 moles of SO2 are oxidised to so3 how many moles of oxygen are required

Answer 1

Answer:These tell you the relative number of molecules involved. 2 sulphur dioxide; 1 oxygen; 2 sulphur trioxide. A mole is simply a huge number just as 'a dozen' is a relatively small number. Answer 2 moles of O2 will be needed.

Explanation:

Answer 2

Answer:

1.5 moles.

Explanation:

First, what is the mass of 3 moles of O2 = ?

molar mass of oxygen = 2 x 16 => 32 grams per mole.

So, 3 moles of O2 has a mass equal to 3 x 32 =>96 grams.

So, we now have to find how many moles of SO2 has a mass = 96 grams.

molar mass of SO2 = 32 + 2 x 16 => 64 grams per mole.

So, 96 grams of SO2 is 64/96 moles =>96/64 => 3/2 => 1.5 moles.

Hence, 1.5 moles of SO2 has the same mass as 3 moles of O2.