Question

5C + 2SO----->CS2+4CO
A. How many moles of C are needed to react with 0.500 mole of SO2?
Answer: 1.25 mole of O2
But how??

Answer 1

In reaction 2 moles of SO2 reacts with 5 moles of C...

So for 0.5 mole of SO2 we should have the same ratio ...

C/SO2 = 5/2

Is that clear?

Answer 2

2 mole of SO need 5 moles of carbon to react
then 0.5 moles of So reacts needs =0.5*5 /2 =1.25 is that correct:)