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a) nCuCl2 = 0,15.2 = 0,3 (mol)
PTHH: 2Al + 3CuCl2 --> 2AlCl3 + 3Cu
____0,2<------0,3--------->0,2---->0,3
=> m = 0,3.64 - 0,2.27 = 13,8 (g)
b) \(C_{M\left(AlCl_3\right)}=\dfrac{0,2}{0,15}=1,3333M\)
Lời giải:
a.
Diện tích mảnh đất là: $12.10=120$ (m2)
Diện tích phần đất trồng hoa: $6.8=48$ (m2)
b.
Diện tích trồng cỏ là: $120-48=72$ (m2)
Tổng tiền công chi trả để trồng hoa và cỏ là:
$48.40 000 +72.30 000=4080000$ (đồng)
She thanks me for inviting her to the party.
Why's Mr.Grim sitting in a boat and fishing?
Do your classmates do their homework in the library?
Kate is going to tell her younger sister about her trip to Japan.
My sister loves taking care of small animals.
She thanks me for inviting her to the party.
Why's Mr. Grim interested in sitting in a boat and fishing?
Do your classmates do their homework in the library?
Kate is going to tell her younger sister about her trip to Japan
My sister loves taking care of small animals
=>1/5 so cam la 6 qua
=> so cam la 30 qua
=>so quyt la 5 qua
1 A
2 D
3 B
4 D
5 A
6 D
7 C
8 A
9 C
10 B
11 D
IV
12 went
13 is playing
14 closing
15 don't drink
16 would visit
17 B
18 D
19 B
20 D
21 cook
22 it
23 his
24 On
25 him
26 because
27 B
28 D
29 C
30 B
31 A
VIII
1 Janet isn't interested in watching sports on TV
2 I Think you should go to school by bike
3 Lake Baikal is the deepest lake in the world
4 He doesn't have enough time to complete the test
5 The last time he visited HLB is 5 years ago
IX
37 In dry season there is alway a lack of water
38 Yesterday he was so tired that he didn't finish his work
39 There are 10 fingers and two arms on the body
40 What kind of TV programme do you like to watch the most when you were small?
c: Xét tứ giác AEDF có
\(\widehat{AED}=\widehat{AFD}=\widehat{FAE}=90^0\)
Do đó: AEDF là hình chữ nhật
mà AD là tia phân giác của \(\widehat{DAE}\)
nên AEDF là hình vuông