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Setarakan reaksi:
4NH3 + 7O2 ➡ 4NO2 + 6H2O
Gunakan perbandingan koefisien utk mencari volume O2
V O2 = 7/4 × V NH3
V O2 = 7/4 × 4 L
V O2 = 7 L
Volume udara yg diperlukan
= 100%/20% × 7 L
= 35 L
V O₂ = 7/4 x 4 = 7 L
V udara yang dipakai = 100%/20% x 7 L = 35 L