Ответ:
Mr(HCl) = 1+35,5 = 36,5
Mr(H₂CO₃) =1·2+12+16·3 = 62
Mr(CO₂) =12 =16·2=44
Mr(Na₂O) =23·2+16 = 62
Mr(CuO) = 64+16 = 80
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Ответ:
Mr(HCl) = 1+35,5 = 36,5
Mr(H₂CO₃) =1·2+12+16·3 = 62
Mr(CO₂) =12 =16·2=44
Mr(Na₂O) =23·2+16 = 62
Mr(CuO) = 64+16 = 80