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H3AsO3 + I2 + H2O → H3AsO4 + HI
↓2e ↑2e
------2e----
1 1
Masa molowa jodu to 254 g/mol, proporcja:
254 g 2 mol
H3AsO4 + I2 + H2O → H3AsO4 + 2HI
x 0.05 mol
x = 6.35 g jodu.
proszę :)