Mr(CaCO3) =40+12+16×3=100Mr
((CuOH) 2CO3)=( 64+16+1) ×2 +12+16×3=222Mr
(C12H22O11) =12×12+1×22+16×11 =342Mr
(FeSO4×7H2O)= 56+32+16×4+7(1×2+16)=278
Mr(CaCO3) =40+12+16×3=100Mr
((CuOH) 2CO3)=( 64+16+1) ×2 +12+16×3=222Mr
(C12H22O11) =12×12+1×22+16×11 =342Mr
(FeSO4×7H2O)= 56+32+16×4+7(1×2+16)=278