Răspuns:
nH :nS : nO= 2:1:4
A,Cu=64 AS=32 AO=16
mCu:mS;mO= 64g:32:4gX16g simplifica cat se poate !!!!!!
mAl:mS:mO= 2X27g:3X32g:12X16g
=54g:96g:192g---> TOTAL 342g
342gSARE........54gAl.....96gS.......192gO
100g............................x..........y.............z
x=15,9% AL y=28% S z=56,2%O
M,Cu(NO3)2= (64gCu + 2x12gN+6x16gO/mol=188g
188g sare........64g Cu......24gN........96gO
100G........................X................Y............Z
X= 100X64/188
Y=100X24/188
Z=100X96/188 finalizeaza calculele !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!1
Explicație:
342