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P: 2a + 4b = d + e
I: 4a = d
H: 2c = 4d + 3e
O: c = 4e
a = 1
4a = d
d = 4
c = 4e → 2c = 8e
8e = 4d + 3e → 4d = 5e
16 = 5e
e = 3.2
2c = 4d + 3e
2c = 16 + 9.6
c = 12.8
2a + 4b = d + e
2 + 4b = 4 + 3.2
4b = 5.2
b = 1.3
a = 1
b = 1.3
c = 12.8
d = 4
e = 3.2
P2I4 + 1.3P4 + 12.8H2O → 4PH4I + 3.2H3PO4 /·10
10P2I4 13P4 + 128H2O → 40PH4I + 32H3PO4
proszę :)