Вычислить эквивалентную массу H2SO4 в следующих реакциях:

а) Zn+H2SO4(разб.)=ZnSO4+H2

б) 2HBr+H2SO4(конц.)=Br2+SO2+2H2O

в) 8HI+H2SO4(конц.)=4I2+H2S+4H2O
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