Which of the following equations are balanced?
A: 2H2 + O2 → 2H2O
B: 2S + 3O2 → 2SO3
C: Li + Cl2 → LiCl
D: 2K + 2H2O → H2 + 2KOH
E: 2Fe + Cu (NO3) 2 → 2Cu + Fe (NO3) 2
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