Va rogggg multttt
Dau coroană
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Răspuns:
Explicație:calculezi masa de substanta pura: (80*8)/100=6,4g Mg pur.pe reactie pui sub Mg 6,4g iar deasupra 2*24=48(24masa Mg).Sub MgO pui x iar deasupra pui masa moleculara,24+16=40,ai 2 in fata formulei si atunci 2*40=80.Ai un raport :48/6,4=80/x ,x=( 6,4*80)/48,X=10,66gMgO