Question

Calculat masa de hidrogen ce se obtine prin reactia Mg cu 730 g acid clorhidric 10%.Cati moli de sare s-au obtinut?

Answer 1

M,HCl= 36,5g/mol

c= mdx100/ms----> md= cxms/1oo= 10x730/100= 73g
n(niu)=m/M= 73g/36,5g/mol=2mol


               2mol..............1mol......1mol
Mg    +    2HCl-------> MgCl2  + H2
             2mol.........x=1mol.........y=1mol
x= 1mol MgCl2
y= 1molH2----> m=nxM= 2molx2g/mol= 4gH2