Question

将足量金属锌投入100ml2mol·L-1盐酸中,能放出标准状况下H2的体积是?

Answer 1

Zn + 2HCl = ZnCl2 + H2

2mol 1mol 22.4L

2mol/L*0.1L=0.2mol n(ZnCl2) V(H2)

V(H2)=22.4L*0.2mol/2mol=2.24L

n(ZnCl2 )=1mol*0.2mol/2mol=0.1mol

c（ZnCl2 )=n(ZnCl2 )/V=0.1mol/0.1L=1mol/L