Помогите расставить коэффициенты!Пожалуйста!
au +hno3+hcl=h(aucl4) + no2+h2o
mn(no3)3 + nabio3+hno3=hmno4+biono3+nano3+h2o
сa(clo2)+na2s+h2o=cacl2+s+naoh
na2c2o4+kbro3+h2o=co2+kbr+naoh

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