P2O3<span> + 3H</span>2O = 2H3PO<span>3
</span>PCl3<span> + 3H</span>2O = H3PO3<span> + 3HCl
</span>H4P2O6<span> + H</span>2O = H3PO3<span> + H</span>3PO<span>4</span>
100-------98
1800-----Х
Х=(1800×98):100=1764
С=1764:98=18г/литр
N(x) = 5.6/22.4 = 0.25 моль
0.25 = 11/М
М = 11/0.25 = 11*4 = 44 г/моль
14n = 42
n = 42/12 = 3.
C3H8 — пропан.