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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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3+<br />

/Fe 2+<br />

3+<br />

/Fe 2+ :<br />

Cu<br />

Fe<br />

2 3<br />

Cu<br />

Fe<br />

2<br />

Ag<br />

Ag<br />

2(SO 4 ) 3 . Sau khi<br />

m là<br />

(A) 12,80. (B) 12,00. (C) 6,40. (D) 16,53.<br />

Zn = x (mol); n Cu = 2x (mol).<br />

Theo bài ra ta có: 65.x + 64.2x = 19,3<br />

x = 0,1 (mol).<br />

n 2n 0, 4 (mol).<br />

3<br />

Fe<br />

Fe 2 (SO 4 ) 3<br />

3Zn + 2Fe 3+ 3Zn 2+ + 2Fe (1)<br />

Fe + 2Fe 3+ 3Fe 2+ (2)<br />

Cu + 2Fe 3+ Cu 2+ + 2Fe 2+ (3)<br />

2 0,2<br />

n<br />

3<br />

n n (mol).<br />

Fe (p−) Fe (sinh ra) Zn<br />

3 3<br />

3+<br />

0,2 1<br />

= (mol).<br />

3 3<br />

0,2 0, 4<br />

n<br />

3<br />

2n 2. (mol).<br />

Fe (p−) Fe<br />

3 3<br />

3+<br />

1<br />

n n 0,1 (mol).<br />

Cu (p−) Fe<br />

2<br />

3<br />

n = 0,2 – 0,1 = 0,1 (mol).<br />

1 0, 4 =0,2 (mol).<br />

3 3<br />

Cu = 64.0,1 = 6,4 (gam)<br />

.<br />

6<br />

348

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