Question

1.Cate g de O se gasesc in 400g NaOH?
2.Ce masa de cupru se gaseste in 320g CuSO4?
3.Cate g de CuSO4 se gasesc in 640g O?

Answer 1

1 MNaOH=23+16+1 =40 u.a.m
40 gNaOH ................16g O
400g...............x=160g
2 MCuSO4=64+32+4*16=160 u.a.m
160 g CuSO4........64 gCu
320 g.....................y=128 g
3. MCuSO4=160
160g CuSO4......64gO
z...........................640 g
z=1600 g