Mol of H2S =
Mol of SO2 =
This means that since the ratio should be 2:1, andn since 0.469/2 = 0.235 (Rounding), the H2S is the limiting reagent.
This means remaining SO2 = 0.312 - 0.469/2 = 0.077
As such, the remaining mass is 0.077*(16*2+32.065) = 4.93 grams of SO2(3 S.F)
Apologies for all the edits - I am a bit dumb and didn't realise the SO2 wasn't 2SO2