Question

how many moles of sulphur dioxide have the same mass as 3 moles of oxygen

Answer 1

Dear Student,
1 mole of oxygen= 32 gm
3 moles of oxygen= $3\times 32$= 96 gm
1 mole of SO₂= $32+(2\times 16)$ = 64 gm
Since number of moles =$\frac{mass}{M.mass}$
mass of SO₂ in this case = 96 gm
So number of moles= $\frac{96}{64}$
n _SO2= 1. 5 moles
1.5 moles of SO₂ have the same mass as 3 moles of O₂
Regards!