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Na₂O = 2 × 23 + 16 =62 mol/gram
2)
N₂O₅
28 : 80
7 :20
3)
Al₂O₃
54/102×100%= 52,94%
4) Fe + O₂ ⇒ FeO
56g----------72g
x -----------100g
x = 56/72 ×100
x = 77.(7)g ≈77.8
5) Pb + O₂ ⇒ PbO₂
207g --------239g
20g ----------x
x = 239×20 /207
x =23.09g
6) 7:20
28:80 N₂O₅
7) Fe = 56u
O= 16u
Fe₂O₃ = 56u ×2 +16u ×3 = 160u
112/160 × 100% = 70%