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Ca₃(PO₄)₂ → 3 Ca + 2 P + 8 O
koefisien Ca₃(PO₄)₂ = 1
koefisien Ca = 3
koefisien P = 2
koefisien O = 8
n P = 0,864 mol
n Ca₃(PO₄)₂ = (koef. Ca₃(PO₄)₂ / koef. P) × n P
= 1/2 × 0,864 mol
= 0,432 mol
Nomor 2
Klorofil (C₅₅H₇₂MgN₄O₅)
C₅₅H₇₂MgN₄O₅ → 55 C + 36 H₂ + Mg + 2 N₂ + 2,5 O₂
m Mg = 0,0011 gram
Ar Mg = 24
n Mg = m / Ar = 0,0011 gr / 24 = 4,6 ×10⁻⁵ mol
n C = (koef.C / koef. Mg) × n Mg = 0,00253 mol
Ar C = 12
m C = n × Ar = 0,00253 × 12 = 0.03025 gram