Hey,
Second one isn't so bad... moles=mass/molar mass
So O2 has moles= x/32
and S02 has moles= x/32 + 32 = x/64
Now equal moles of gas occupy an equal volume at the same temp and pressure.
So for this to hold true, the SO2 must have half the pressure as it has twice as many moles.
Hope this...