nO2= 1,5 mol
a, C+ O2 $\buildrel{{t^o}}\over\longrightarrow$ CO2
=> nC= 1,5 mol
=> mC= 18g
b, 2H2+ O2 $\buildrel{{t^o}}\over\longrightarrow$ 2H2O
=> nH2= 0,75 mol
=> mH2= 1,5g
c, S+ O2 $\buildrel{{t^o}}\over\longrightarrow$ SO2
=> nS= 1,5 mol
=> mS= 48g
d, 4P+ 5O2 $\buildrel{{t^o}}\over\longrightarrow$ 2P2O5
=> nP= 1,2 mol
=> mP= 37,2g