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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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4<br />

2SO 4 (loãng, dư), sau<br />

(A) 48,15 %. (B) 51,85 %.<br />

(C) 58,52 %. (D) 41,48 %.<br />

–<br />

Zn + Cu 2+ Zn 2+ + Cu (1)<br />

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

> m Fe<br />

= 0,28 (gam).<br />

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

2SO 4 loãng<br />

X = 65x + 56y + 0,28 = 2,7<br />

65x + 56y = 2,42 ( )<br />

nCu nZn nFe<br />

x y (mol).<br />

) và (<br />

x + y = 0,04 ( )<br />

m Fe = 56.0,02 + 0,28 = 1,4 (gam).<br />

1, 4<br />

%m<br />

Fe<br />

.100% 51,85 %<br />

2,7<br />

.<br />

E 3) 2<br />

và AgNO 3<br />

(A) Fe, Cu, Ag.<br />

(C) Al, Fe, Cu.<br />

(B) Al, Cu, Ag.<br />

(D) Al, Fe, Ag.<br />

7<br />

349

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