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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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VD2: 4<br />

m M = 2,36 (gam)<br />

n M =<br />

2nO 2<br />

0,04 (mol)<br />

VD3<br />

FeCl 3 , 0,2 mol CuCl 2<br />

®pdd<br />

4 + 2H 2 O 2M + O 2 + 2H 2 SO 4<br />

M M = 59<br />

M là Ni.<br />

quá trình<br />

(A) 5,60. (B) 11,20.<br />

(C) 22,40. (D) 4,48.<br />

Có Fe 3+ , Cu 2+ , H + .<br />

3+<br />

> Cu 2+ > H + > Fe 2+ .<br />

khí Fe 3+ , Cu 2+<br />

3+<br />

+ e Fe 2+ (1)<br />

Cu 2+ + 2e Cu 0 (2)<br />

Có Cl – , H 2 O Cl –<br />

–<br />

– 2e Cl 2<br />

0<br />

(3)<br />

–<br />

n n n<br />

e nhËn 3<br />

2n<br />

2<br />

0,5 (mol).<br />

Fe Cu<br />

–<br />

n n 0,8 (mol) > n<br />

e (Cl )<br />

Cl<br />

e<br />

2<br />

1<br />

n n 0,25 (mol) V = 5,6 (lÝt).<br />

Cl2<br />

e<br />

2<br />

.<br />

6<br />

288

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