Ответ:
2Mg+O2---2MgO
Mr(Mg)=48
Mr(MgO)=80
12г----xг
48----80
x=12×80/48=20
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Ответ:
2Mg+O2---2MgO
Mr(Mg)=48
Mr(MgO)=80
12г----xг
48----80
x=12×80/48=20