Tentukan jumlah ion Cl- dalam 0,4 mol CaCl²

tentukan jumlah ion Cl- dalam 0,4 mol CaCl²

Jawaban: jumlah ion Cl- dalam 0,4 mol CaCl2 adalah 4,8 x 10^23 ion

Jumlah ion, partikel, atau molekul dapat ditunjukkan dengan N. Satu mol zat mengandung jumlah partikel yang sama dengan jumlah partikel dalam 12,0 gram isotop C-12 yakni 6,02 x 10^23 partikel. Jumlah partikel ini disebut Bilangan Avogadro (NA = Number Avogadro) atau dalam bahasa Jerman Bilangan Loschmidt (L).

CaCl2 → Ca2+ + 2Cl-
Perbandingan mol sebanding dengan perbandingan koefisien reaksinya. Maka, mol ion Cl- adalah:
n Cl-/koefisien Cl- = n CaCl2/koefisien CaCl2
n Cl-/2 = 0,4 mol/1
n Cl- = 0,8 mol

Jumlah ion Cl- adalah:
N = n x L
N = 0,8 mol x 6,02 x 10^23
N = 4,8 x 10^23 ion

Jadi, jumlah ion Cl- dalam 0,4 mol CaCl2 adalah 4,8 x 10^23 ion.

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