sigur te ajut cu drag prietene:)
1)MH2SO4=2×AH+AS+4×AO=2+32+64=98 g/mol
1 mol H2SO4.....32 g S
x moliH2SO4....64 g S
x=2 moli H2SO4
2)MZnO=AZn+AO=65+16=81 g/mol
1 mol ZnO........65 g Zn
3 moli ZnO......x g Zn
x=195 g Zn
3)MCuSO4=ACu+AS+4×AO=64+32+64=160 g/mol
160 g CuSO4......64 g Cu
x g CuSO4..........128gCu
x=320 g
Sper ca te-am ajutat!!!
