4P+5O2----->2P2O5
P2O5+3H2O---->2H3PO4
6,2Kg=6200g
n P=\(\frac{6200}{31}=200\left(mol\right)\)
Theo pthh1
n P2O5=\(\frac{1}{2}n_P=100\left(mol\right)\)
Theo pthh2
n\(_{H3PO4}=2n_{P2O5}=200\left(mol\right)\)
V\(_{H3PO4}=\frac{200}{2}=100\left(l\right)\)