Підтвердіть дію закону збереження маси речовин 4Аs+3O2=2As2O3 по прикладу:
Mn+O2=2Mn2O7
m1+m2=m3
4*Mr+7*Mr=2*Mr
Mr (Mn)=55
Mr (O2)=32
Mr (Mn2O7)=(2*55)+(7*16)=222
4Mn+7O2=2Mn2O7
4*55+7*32=2*222
220+224=444
444=444
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