Răspuns:
NaCl
MNaCl=ANa+ACl =23+35,5=58,5
58,5gNaCl.......23gNa......35,5gCl
100gNaCl..........xgNa...........ygCl
x=10×23/58,5=calculează
y=100×35,5/58,5=calculează MNaOH
Cu(OH)2
MCu(OH)2=ACu+2×AO+2×AH=64+16×2+2×1=98
98gCu(OH)2.......64gCu......32gO......2gH
100gCu(OH)2......agCu...........bgO........cgH
a=100×64/98=calculează
b=100×32/98=calculează
c=100×2/98=calculează