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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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HCl, H 2 SO 4<br />

3+<br />

/Fe 2+ .<br />

2SO 4 loãng<br />

2SO 4 loãng<br />

Coi Fe 3 O 4 = FeO.Fe 2 O 3 Fe 3 O 4 + 8HCl FeCl 2 + 2FeCl 3 + 4H 2 O<br />

m + m axit = m + m<br />

m oxit + m axit = m + m<br />

2SO 4 loãng, thu<br />

(A) 9,52. (B) 10,27. (C) 8,98. (D) 7,25.<br />

nH 2<br />

0,06 (mol).<br />

Theo PT (1), (2), (3) ta có:<br />

2SO 4 FeSO 4 + H 2 (1)<br />

Mg + H 2 SO 4 MgSO 4 + H 2 (2)<br />

Zn + H 2 SO 4 ZnSO 4 + H 2 (3)<br />

n n 0,06 (mol).<br />

H2SO4 H2<br />

m + m axit = m + m<br />

m = m + m axit – m = 3,22 + 0,06.98 – 0,06.2 = 8,98 (gam)<br />

.<br />

Fe 3 O 4 và Fe 2 O 3 2 O 3<br />

(A) 0,23. (B) 0,18. (C) 0,08. (D) 0,16.<br />

Vì n n<br />

3O 4 (FeO.Fe 2 O 3 ).<br />

FeO<br />

Fe2O3<br />

nFe3O<br />

4<br />

0,01 (mol).<br />

3O 4 + 8HCl<br />

n HCl = 0,08 (mol) V HCl = 0,08 (lít) .<br />

FeCl 2 + 2FeCl 3 + 4H 2 O<br />

1<br />

343

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