a)
4P+5O2\(\rightarrow\)2P2O5
S+O2\(\rightarrow\)SO2
nSO2=\(\frac{0,896}{22,4}\)=0,04 mol
\(\rightarrow\)nS=nSO2=0,04 mol
\(\rightarrow\)nP=\(\frac{0,04}{2}\)=0,02 mol
mhh=0,04.32+0,02.31=1,9 g
%mS=0,04.32/1,9.100=67,37%
%mP=100-67,37=32,63%
b)
nP2O5=\(\frac{0,02}{2}\)=0,01 mol
mP2O5=0,01.142=1,42 g
4P + 5O2 -to-> 2P2O5
S + O2 -to-> SO2
nSO2 = 0.896/22.4 = 0.04 mol
=> nS = 0.04 mol => mS = 1.28 g
=> nP = 0.02 mol => mP = 0.62 g
mhh = 1.28 + 0.62 = 1.9 g
%S = 67.37%
%P = 32.63%
mP2O5 = 0.01*142= 1.42 g