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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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VD5: 2 và O 2<br />

2, MgO, AlCl 3 và Al 2 O 3<br />

2 MgCl 2 2Mg + O 2 2MgO<br />

2Al + 3Cl 2 2AlCl 3 4Al + 3O 2 2Al 2 O 3<br />

Cl2 O2<br />

X + m Y = m Z<br />

m X = m Z – m Y = 42,34 – 16,98 = 25,36 (gam)<br />

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

n<br />

X<br />

X<br />

0,5 (mol)<br />

m 25,36 (gam)<br />

x + y 0,5<br />

71x + 32y 25,36<br />

x<br />

y<br />

0,24 (mol).<br />

0,26 (mol).<br />

0,24 .100 % 48 (%).<br />

0,5<br />

n a (mol); n b (mol).<br />

Al<br />

Mg<br />

0 3<br />

Al - 3e<br />

Al<br />

0 2<br />

Mg - 2e<br />

Mg<br />

0 2<br />

O + 4e<br />

a 3a 0,26 1,04 (mol e)<br />

2<br />

0 1<br />

Cl + 2e<br />

b 2b 0,24 0,48 (mol e)<br />

n = 3a + 2b (mol e) n = 1,04 + 0,48 = 1,52 (mol e)<br />

2<br />

2O<br />

2Cl<br />

Y = 16,98 (gam) 27a + 24b = 16,98 (2)<br />

3a 2b 1,52 x 0,14 (mol)<br />

27a 24b 16,98 y 0,55 (mol)<br />

Al = 0,14.27 = 3,78 (gam).<br />

3<br />

134

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