Question

Hoa tan hoan toan 14,6g hon hop gom Zn va ZnO bang dung dich HCl 7,3% nguoi ta thu duoc 2,24 lit khi o dktc.

â. viết pthh xảy ra

b. tinh khoi luong moi chat trong hon hop ban dau

c. tinh khoi luong cua dung dich HCl 7,3% can dung de hoa tan het hon hop tren

Answer 1

a) pthh:

1) Zn + 2HCl -> ZnCl2 + H2

2) ZnO + 2HCl -> ZnCl2 + H2O

b) ta có : V_H2 = 2,24l

=> n_H2 = 0,1mol

pt

1) Zn + 2HCl -> ZnCl2 + H2

1mol.....2mol......1mol.......1mol

0,1mol...0,2mol....0,1mol..0,1mol

=> n_Zn = 0,1mol

=> m_Zn = 0,1.65 = 6,5g

ta có m_Zn + m_ZnO = m_hh

=> m_ZnO = m_hh - m_Zn = 14,6 - 6,5 = 8,1g

c) ta có : n_HCl = 0,4mol

=> m_HCl = 0,4 . 36,5 = 14,6 g

=> m_ddHCl = 200g