\(a,PTHH:4P+5O_2\underrightarrow{t^o}2P_2O_5\)
\(n_P=\dfrac{m}{M}=\dfrac{6,2}{31}=0,2\left(mol\right)\\ Theo.PTHH:n_{O_2}=\dfrac{5}{4}.n_P=\dfrac{5}{4}.0,2=0,25\left(mol\right)\\ V_{O_2}=n.22,4=0,25.22,4=5,6\left(l\right)\)
\(b,Theo.PTHH:n_{P_2O_5}=\dfrac{1}{2}.n_P=\dfrac{1}{2}.0,2.0,1\left(mol\right)\\ m_{P_2O_5}=n.M=0,1.142=14,2\left(g\right)\)
4P+5O2-to>2P2O5
0,2---0,25-----0,1 mol
n P=\(\dfrac{6,2}{31}\)=0,2 mol
=>VO2= 0,25.22,4=5,6l
=>m P2O5 =0,1.142=14,2g