СРОЧНО Вычислите сумму коефициентов:
1)BaCO3 + H2SO3 = CO2 + H2O + BaSO3
2)SO3 + H2O= H2SO4
3)2H2O + 2Na = H2 + 2 NaOH
4)H2 + I2 = 2 HI
5)SO2 + 2H2S = 2H2O + 3S
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