4Na+O2--->2Na2O
mNa=23 u
mNa2O=2*23u+16u=62 u
4*23 u Na---2*62 u Na2O
184 g Na---x g Na2O
x=248 g
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4Na+O2--->2Na2O
mNa=23 u
mNa2O=2*23u+16u=62 u
4*23 u Na---2*62 u Na2O
184 g Na---x g Na2O
x=248 g