Question

cho 6,885 gam nhom kim loai phan ung voi dung dich axit h2so4 loang co chua 34,4 gam h2so4 tinh khiet (sinh ra al2(so4)3 va giai phong khi hidro)

a tinh the tich khi hidro sinh ra(dktc)

b de thu duoc luong hidro tren thi phai dung bao nhieu gam kim loai sat cho phan ung voi axit hcl du

Answer 1

\(2Al+3H_2SO_4\rightarrow Al_2\left(SO_4\right)_3+3H_2\)

\(n_{Al}=\frac{6,885}{27}=0,255\left(mol\right)\)

\(n_{H2SO4}=\frac{34,4}{98}=0,351\left(mol\right)\)

Vì 3/2n Al > nH2SO4 nên Al dư\(n_{H2}=n_{H2SO_4}=0,351\left(mol\right)\rightarrow V_{H2}=0,351.22,4=7,8624\left(l\right)\)\(Fe+2HCl\rightarrow FeCl_2+H_2\)

\(n_F=n_{H2}=0,351\left(mol\right)\)

\(\rightarrow m_{Fe}=0,351.56=19,656\left(g\right)\)