HOC24
Lớp học
Môn học
Chủ đề / Chương
Bài học
1,were lived
2, drinking
3, has lived
4, go
5, bought
6, haven't seen
7, was studied
ông gửi tách ra dài vcl
75b
76c
77a
78a
79d
80c
6a
7d
8c
9c
10d
11d
12a
13c
14b
15b
a, 6x3y2+12x2y-8xy
=2xy(3x2y+6x-4)
nZnO=8,1:81=0,1(mol)
PTHH Zn+O2-->ZnO
=>nZn=nZnO=0,1 mol
=>mZn=0,1 x 65 = 6,5 (g)
16a
17a
18c
19d
20c
7b
8d
9a
10a
11c
12b
13b
14d
15c