bantu cari dong kak
Nilai Ar (K = 39, S = 32, O = 16, Mg = 24, H = 1, Cu = 64)
a) Mr K2SO4 = 2 Ar K + Ar S + 4 Ar O
= (2×39) + 32 + (4×16)
= 78 + 32 + 64
= 174
b) Mr CuSO4 = Ar Cu + Ar S + 4 Ar O
= 64 + 32 + (4×16)
= 64 + 32 + 64
= 160
c) Mr Mg(OH)2 = Ar Mg + 2 Ar O + 2 Ar H
= 24 + (2×16) + (2×1)
= 24 + 32 + 2
= 58
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