kalsium hidrosida Mr nya adalah

Kalsium Hidroksida
Ca(OH)2
= Ar Ca : 40
= Ar O : 16
= Ar H : 1
Mr = Ar Ca + Ar O + Ar H
Mr = 40 + (16+1)2
Mr = 40 + (17x2)
Mr = 40 + 34
Mr = 74

Semoga membantu :)

Ca(OH)2
Ca =40 ×1=40
O = 16 ×2 = 32
H= 1 ×2 = 2
Total = Mr= 74