Which of these formulas contain equal numbers of oxygen atoms?
1... a, l, o, h, 3...
2... m, g, 3, p, o, 4, 2...
3... 2, a, l, 2, o, 3...
4... c, a, n, o, 3, 2...
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formulas 1 and 3
formulas 1 and 4
formulas 2 and 3
formulas 3 and 4
