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BÀI TẬP TRẮC NGHIỆM HÓA ĐẠI CƯƠNG VÀ VÔ CƠ CẨM NANG DÙNG LUYỆN THI THPTQG CHẤT LƯỢNG CAO (COLOR BOOK)

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VD6: 2<br />

2.<br />

Theo (1):<br />

2 MgX 2 (1)<br />

2Al + 3X 2 2AlX 3 (2)<br />

n n<br />

X MgX 2<br />

Theo (2):<br />

n<br />

3<br />

n<br />

2<br />

X AlX 3<br />

n<br />

3<br />

n<br />

2<br />

MgX2 AlX3<br />

( )<br />

n<br />

n<br />

MgX2<br />

AlX3<br />

18, 4<br />

24 2M<br />

17,8<br />

27 3M<br />

X<br />

X<br />

) ta có:<br />

18, 4 3 17,8<br />

.<br />

24 2M 2 27 3M<br />

X<br />

X<br />

X = 80 (g/mol)<br />

2.<br />

1<br />

(A) K. (B) Li. (C) Na. (D) Ag.<br />

2<br />

(A) Fe. (B) Al. (C) Cu. (D) Cr.<br />

3<br />

lít khí F 2<br />

(A) Al. (B) Cu. (C) Zn. (D) Fe.<br />

4<br />

lít khí Cl 2<br />

(A) 15,68. (B) 7,84. (C) 3,92. (D) 9,96.<br />

5<br />

(A) 11,2. (B) 13,44. (C) 6,72. (D) 2,688.<br />

4<br />

135

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