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Balancea las siguientes ecuaciones químicas:

1. NaOH (ac) + CaBr₂ (ac) -> Ca(OH)₂ (s) + NaBr(ac)

2. K₂CrO4(ac) + Pb(NO3)2 (ac) -> KNO3(ac) + PbCrO4 (ac)

3. CH4 (g) + O₂ (g) -> CO₂ (g) + H ₂0 (1)​