Tentukan massa relatif unsur M, jika di ketahui massa molekul relatif M2 SO4=124 (Ars =32, 0=16

Mr M2SO4 = 2Ar M + Ar S + 4(Ar O)
124 = 2Ar M + 32 + 4(16)
2Ar M = 28
Ar M = 14 g/mol

Mapel: Kimia
Kelas: X
Materi: Stoikiometri
Kata Kunci: Massa Atom Relatif dan Molekul Relatif

Jawab

Mr M2SO4= 124
Mr [2×Mr M] + [ Ar S ] + [ 4×Ar O ]= 124
Mr [2×Mr M] + [32] + [ 64] = 124
Mr [ 2×Mr M ] + 96 = 124
Mr 2 × Mr M= 124-96
Mr M = 28/2
Mr M= 14g/mol