Ответ:
3Na2S+K2Cr2O7+7H2SO4= Cr2(SO4)3+3S+3Na2SO4+K2SO4+7H2O
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Ответ:
3Na2S+K2Cr2O7+7H2SO4= Cr2(SO4)3+3S+3Na2SO4+K2SO4+7H2O