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mMg=24u
mMgO=24u+16u=40u
2Mg + 02----->2MgO
2*24g Mg------2*40g MgO
6g Mg-----------xg MgO
x=10g MgO
2.
mZn=65u
Zn + H2SO4----->ZnSO4 + H2
65g Zn------22,4dm3 H2
20g Zn-------xdm3 H2
x=6,89dm3 H2