ii iii vi vii viii ix
Iron Oxide+Hydrofluoric Acid --> Iron Fluoride + water For Iron II oxide: FeO+ 2HF --> FeF2 + H2O For iron III oxide Fe2O3 + 6 HF --> 2 FeF3+ 3 H2O Iron II,III oxide Fe3O4 + 8HF --> FeF2 + 2FeF3+ 4 H2O
6 + 4 + 3 + 4 + 4 + 5 + 4 + 6 + 5 + 4 + 8 + 4 = 57
2 4 0 5 4 3 6 6 9 4
4 + 6 + 6 + 5 + 5 + 4 + 6 + 5 + 5 + 6 + 5 + 5 + 5 + 3 = 70
9 + 9 + 9 + 9 + 9 + 9 + 6 + 6 + 6 + 6 + 2 + 2 + 23 + 3 + 3 + 4 + 4 + 4 = 123
7 + 5 + 4 + 5 + 3 + 4 + 6 + 5 + 4 + 5 + 6 + 4 + 7 = 65
I ii iii iv v vi vii viii
3+4+6+4=17
6 + 4 = 4 + 6 is an example of the Commutative property of addition.
I = 1, II = 2, III = 3, IV = 4, V = 5, VI = 6, VII = 7, VIII = 8, IX = 9, X = 10
3 + 4 + 2 + 8 + 6 + 0.3 + 4 + 2 + 8 + 6 + 0.3 + 4 + 2 = 49.6