Diketahui massa atom relatif (ar) =12 o=16ca=40 maka massa 2 mol caco3 adalah

massa = mol x Mr
massa = 2 x (40+12+48)
massa = 2 x 100 = 200 gram

Mr CaCO₃
= Ar Ca + Ar C + 3 × Ar O
= 40 + 12 + 3 × 16
= 40 + 12 + 48
= 100

m CaCO₃
= n . Mr
= 2 . 100
= 200 g