Hitung persen komposisi kalsium dalam fosfat ca3(po4)2 ca40.p31.o16

Mapel: Kimia
Kelas: X
Materi: Stoikiometri
Kata Kunci: Kadar Unsur

Jawab

Mr Ca3(PO4)2
Mr= 3×Ar Ca + 2×Ar P + 8×Ar O
Mr = 3×40 + 2×31 + 8×16
Mr= 310g/mol

kadar Ca = n Ar Ca/Mr ×100%
= 3×40/310×100%
= 120/310 × 100%
= 38,70%

Ca3(po4)2=(3×Ar ca)+(2×Ar p)+ (8×Ar o)
= (3×40) + (2×31)+ (8× 16)
= 120 + 62 + 128
= 310