December 2019 1 343 Report
Setarakan persamaan reaksi yang belum setara berikut:

1) a NaCrO2 (aq) + b NaOH + c Br2 → d Na2CrO4 (aq) + 6 NaBr (aq) + 4 H2O (l)

2) a CuO (s) + b NH3(g) à c Cu(s) → d N2(s) + e H2O (l)​
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