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The following reaction occurs spontaneously.

2Al(s) + 6H+(aq) → 2Al3+(aq) + 3H2(g)

Write the balanced oxidation half-reaction.

1. Al(s) → Al3+(aq) + 3e-

2. Al3+(aq) + 3e- --> Al(s)

3. H2(g) --> 2H+(aq) + 2e-

4. 2H+(aq) + 2e- --> H2(g)

5. 2H+(aq) --> H2(g) + 2e-

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