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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, H 2 SO 4<br />

3, H 2 SO 4<br />

2O 3 và<br />

Fe 3 O 4 3 loãng (d<br />

(A) 38,72. (B) 35,50.<br />

(C) 49,09. (D) 34,36.<br />

n NO = 0,06 (mol).<br />

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

HNO 3<br />

Fe 3+ + NO<br />

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

Fe 0 – 3e Fe +3<br />

x 3x (mol e)<br />

N +5 + 3e N +2<br />

0,18 0,06 (mol e)<br />

O 0 + 2e O -2<br />

y 2y (mol e)<br />

enh−êng<br />

3x (mol e) enhËn<br />

2y 0,18 (mol e)<br />

x<br />

0,16 (mol)<br />

y = 0,15 (mol)<br />

ta có<br />

nFe nFe(NO 3 )<br />

0,16 (mol).<br />

3<br />

3) 3<br />

38,72 (gam).<br />

.<br />

5<br />

356

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