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HEINS09-095-117v4.qxd 12/30/06 1:58 PM Page 99<br />
- <strong>Chapter</strong> 9 -<br />
8. Mole ratios<br />
3 CaCl 2 + 2 H 3 PO 4 ¡ Ca 3 (PO 4 ) 2 + 6 HCl<br />
(a)<br />
(b)<br />
(c)<br />
3 mol CaCl 2<br />
1 mol Ca 3 (PO 4 ) 2<br />
(d)<br />
1 mol Ca 3 (PO 4 ) 2<br />
2 mol H 3 PO 4<br />
6 mol HCl<br />
6 mol HCl<br />
(e)<br />
2 mol H 3 PO 4 1 mol Ca 3 (PO 4 ) 2<br />
3 mol CaCl 2<br />
2 mol H 3 PO 4<br />
(f)<br />
2 mol H 3 PO 4 6 mol HCl<br />
9.<br />
C 2 H 5 OH + 3 O 2 ¡ 2 CO 2 + 3 H 2 O<br />
2 mol CO 2<br />
17.75 mol C 2 H 5 OH2¢<br />
1 mol C 2 H 5 OH ≤ = 15.5 mol CO 2<br />
10. The balanced equation is 4 HCl + O 2 ¡ 2 Cl 2 + 2 H 2 O<br />
15.60 mol HCl2¢ 2 mol Cl 2<br />
4 mol HCl ≤ = 2.80 mol Cl 2<br />
11. The balanced equation is<br />
MnO 2 (s) + 4 HCl(aq) ¡ Cl 2 (g) + MnCl 2 (aq) + 2 H 2 O(l)<br />
(a)<br />
(b)<br />
4 mol HCl<br />
11.05 mol MnO 2 2¢ ≤ = 4.20 mol HCl<br />
1 mol MnO 2<br />
11.25 mol H 2 O2¢ 1 mol MnCl 2<br />
2 mol H 2 O ≤ = 0.625 mol MnCl 2s<br />
12.<br />
Al 4 C 3 + 12 H 2 O ¡ 4 Al(OH) 3 + 3 CH 4<br />
(a)<br />
1100. g Al 4 C 3 2a 1 mol<br />
144.0 g b ¢ 12 mol H 2O<br />
1 mol Al 4 C 3<br />
≤ = 8.33 mol H 2 O<br />
(b) 10.600 mol CH 4 2¢ 4 mol Al(OH) 3<br />
3 mol CH 4<br />
≤ = 0.800 mol Al(OH) 3<br />
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