- M2CO 3+ 2HC1> MCI 2+ CÔt + H2O (2)
Giai he phuong trinh (I) va (II) dugc: x= y= 0,03mol.
7.36. Dapan diing la Co 4 h6n hop ran:
1. N a 2 0 va A l j O , : Tan lioan loan tiong HjO clif. 2. Cu va FeCl,: Khong tan hoan toan trong H 2 O dir.
3. B a C l 2 va C U S O 4 : K h i hoa tan trong nude, tao két tua BaS04.
4. Ba va NaHCO,: K h i hoa tan trong nu6c tgo két tua BaCOj. 131. Dap an dung la A .
4 phan ling oxi hoa - khu xay ra d cac thi nghiem: (I), (II), (III) va (IV). 7.38. Dap an dung la C.
Flo chi CO s6' oxi hoa - 1 trong cac hop cha't.
7.39. Dap an dung la B.
7.40. Dap an dung la C.
7.41. Dap an diing la D .
Trit&c phan I'fng: G o i x va y la so mol N2 va H2 c6 trong X . (x - a) mol N2, (y - 3 a ) mol H2 va 2a mol N H , . Ta c6:
. 28x + 2y
Sail phan Ang:
N2 + 3H2 < = ± 2NH3
Gia sir c6 a m o l N2 phan ling. Trong h6n hop Y co: . 2 8 ( x - a ) + 2 ( y - 3 a ) + 34a Q' ^Y/Hc 4(x + y - 2a) = 2 7.42. 1.43. 7.44. a 1
Thay y = 4x vao (2) va tinh duoc - = -
X 4
-> Hieu suát la 25%.
Dap an diing la B.
Nam chat tac dung duoc vdi dung dich NaOH loang la: NaHCÔ, A K O H ) , , HF, CI2 va N H 4 C I .
Dap an diing la B.
Phuong trinh phan ling: NaHS + HCl ^ H 2 S t + NaCl. Phan ling nay loai bo duoc HCl, thu duoc HjS tinh khiét. Dap an diing la C . So mol cac chát: "co = 17,92 = 0,8 (mol); n s o , ^ ? : ^ = 0 , 9 (mol). 22,4 Ta co: (1) (2) 22,4
Cac phuong trinh phan ling:
M,Oy + yCO - > x M + y C 0 2 y = 0,8 mol. 2M(Cr, Fe) + 6 H 2 S O 4 M2(S04)3 + 3 S O 2 + 6 H 2 O S6'mol M = X = - H s o ,3 SO2 = - . 0 , 9 = 0,6 m o l . 3 ' - > X : y = 0,6 : 0,8 = 3 : 4. C T P T cua M, 0 , la Fe304. (1) (2)
7.45. Dap an dung la B.
D6 dinh duSng cua phan supephotphat kep (Ca(H2P04)2) tinh khiét la: k= - ^ ^ ^ ^ . 1 0 0 % = = l ^ ? : ! ^ =60,68%. k= - ^ ^ ^ ^ . 1 0 0 % = = l ^ ? : ! ^ =60,68%.
Mca(H2P04)2 ' ^ ^ ^
D6 dinh duSng cua phan lan (c6 iSn tap chát) nay la: k ' = 6 0 , 6 8 . ^ ^ =42,25%. 100 k ' = 6 0 , 6 8 . ^ ^ =42,25%. 100
7 . 4 6 . Dap an diing la B. 7.47. Dap an diing la D.