Question

cho 10 gam hon hop Cu va CuO tac dung voi 200ml dd H₂SO₄ 2M . Phan ung ket thuc ,loc tach rieng phan ko tan can nang duoc 6gam

a. Viet phuong trinh hoa hoc xay ra

b.Tinh thanh phan % ve khoi luong cua moi chat trong hon hop ban dau

c. Tinh nong do mol cua cac chat sau phan ung .Biet the tich cua dd thay doi ko dang ke .

Answer 1

a) CuO+H2SO4--->CuSO4+H2O

b) Chất k tan là Cu

%mCu=\(\frac{6}{10}.100\%=60\%\)

%m CuO=100-60=40%

c) Ta có

n CuO=\(\frac{4}{80}=0,05\left(mol\right)\)

n H2SO4=0,2.2=0,4(mol)

--->H2SO4 dư

Theo pthh

n H2SO4=n CuO=0,05(mol)

n H2SO4 dư=0,4-0,05=0,35(mol)

CM H2SO4 dư=\(\frac{0,35}{0,2}=1,75\left(M\right)\)

Theo pthh

n CuSO4=n CuO=0,05(mol)

CM CuSO4=\(\frac{0,05}{0,2}=0,25\left(M\right)\)

Answer 2

https://i.imgur.com/39eyHM0.jpg