4Na + O2 -----> 2Na2O32g O2 ------- 124g Na2OX ------------ 80gX= 20,65g O2
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4Na + O2 -----> 2Na2O
32g O2 ------- 124g Na2O
X ------------ 80g
X= 20,65g O2
124g Na2O -------- 32g O2
80g-------------------- x
x= 20,65g
m= 80 g
M= 23g*2+16= 62g
80/62g= 1,29M
2M-1,29M
1M- x
x= 0,645M*32g= 20,65g