(1,5Đ). C2H2 + 2AGNO3 + 2NH3  C2AG2 + 2NH4NO3 ……….0...

Câu 8.(1,5đ).

C

2

H

2

+ 2AgNO

3

+ 2NH

3

 C

2

Ag

2

+ 2NH

4

NO

3

……….0,25đ

RCHO + 2AgNO

3

+ 3NH

3

+ H

2

O  RCOONH

4

+ 2Ag + 2NH

4

NO

3

………0,25đ

C

2

Ag

2

+ 2HCl  C

2

H

2

+ 2AgCl ………0,25đ

.=> n C

2

H

2

= 0,3 => m RCHO = 14,4 – (0,3.26) = 6,6g ………0,25đ

.nAg = 0,3 => n RCHO = 0,15 => M = 44 ……….0,25đ

.=> CH

3

CHO ……….……….0,25đ