Question

1. Cati moli de atomi se afla in 490grame acid sulfuric
2.Cati moli de atomi se afla in 280grame de fier
3.Cati moli de atomi se afla in 49,6grame oxid de cupru
Am nevoie
Va rog

Answer 1

1.

MH2SO4=2+32 + 4 .16=98------->98g/moli

n= m : M

n=490g : 98g/moli=5 moli H2SO4

2.

n= 280g : 56g/moli=5moli Fe

3.

MCuO=64+16=80-------> 80g/moli

n=49,6 g : 80 g/moli=0,62 moli