Chapter 9

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HEINS09-095-117v4.qxd 12/30/06 1:58 PM Page 100 - <strong>Chapter</strong> 9 - 13. Grams of NaOH Ca(OH) 2 + Na 2 CO 3 ¡ 2 NaOH + CaCO 3 The conversion is: g Ca(OH) 2 ¡ mol Ca(OH) 2 ¡ mol NaOH ¡ g NaOH 1500 g Ca(OH) 2 2a 1 mol 2 mol NaOH ba ba 40.00 g b = 5 * 10 2 g NaOH 74.10 g 1 mol Ca(OH) 2 mol 14. Grams of Zn 3 (PO 4 ) 2 3 Zn + 2 H 3 PO 4 ¡ Zn 3 (PO 4 ) 2 + 3 H 2 The conversion is: g Zn ¡ mol Zn ¡ mol Zn 3 (PO 4 ) 2 ¡ g Zn 3 (PO 4 ) 2 110.0 g Zn2a 1 mol 65.39 g b ¢ 1 mol Zn 3(PO 4 ) 2 ≤ a 386.1 g b = 19.7 g Zn 3 mol Zn mol 3 (PO 4 ) 2 15. The balanced equation is Fe 2 O 3 + 3 C ¡ 2 Fe + 3 CO The conversion is: kg Fe 2 O 3 ¡ kmol Fe 2 O 3 ¡ kmol Fe ¡ kg Fe 1125 kg Fe 2 O 3 2a 1 kmol 2 kmol Fe 55.85 kg ba ba b = 87.4 kg Fe 159.7 kg 1 kmol Fe 2 O 3 kmol 16. The balanced equation is 3 Fe + 4 H 2 O ¡ Fe 3 O 4 + 4 H 2 Calculate the grams of both H 2 O and Fe to produce 375 g Fe 3 O 4 1375 g Fe 3 O 4 2¢ 1 mol 231.6 g ≤ a 4 mol H 2O ≤ a 18.02 g b = 117 g H 1 mol Fe 3 O 4 mol 2 O 1375 g Fe 3 O 4 2a 1 mol 3 mol Fe b ¢ ≤ a 55.85 g b = 271 g Fe 231.6 g 1 mol Fe 3 O 4 mol 17. The balanced equation is 2 C 2 H 6 + 7 O 2 ¡ 4 CO 2 + 6 H 2 O (a) (b) (c) 115.0 mol C 2 H 6 2¢ 7 mol O 2 2 mol C 2 H 6 ≤ = 52.5 mol O 2 18.00 g H 2 O2a 1 mol 18.02 g b ¢ 4 mol CO 2 6 mol H 2 O ≤ a 44.01 g b = 13.0 g CO mol 2 175.0 g C 2 H 6 2a 1 mol 30.07 g b ¢ 4 mol CO 2 ≤ a 44.01 g b = 2.20 * 10 2 g CO 2 mol C 2 H 6 mol 2 (d) 12.75 mol of H 2 O2¢ 4 mol CO 2 6 mol H 2 O ≤ a 44.01 g b = 80.7 g CO mol 2 - 100 -
HEINS09-095-117v4.qxd 12/30/06 1:58 PM Page 101 - <strong>Chapter</strong> 9 - (e) 125.0 mol C 2 H 6 2¢ 7 mol O 2 2 mol C 2 H 6 ≤ a 32.00 g mol O 2 b = 2.80 * 10 3 g O 2 (f) 1125 g H 2 O2¢ 1 mol 18.02 g ≤¢2 mol C 2H 6 6 mol H 2 O ≤ a 30.07 g b = 69.5 g C mol 2 H 6 18. 4 FeS 2 + 11 O 2 ¡ 2 Fe 2 O 3 + 8 SO 2 (a) 11.00 mol FeS 2 2a 2 mol Fe 2O 3 4 mol FeS 2 b = 0.500 mol Fe 2 O 3 (b) 14.50 mol FeS 2 2¢ 11 mol O 2 4 mol FeS 2 ≤ = 12.4 mol O 2 (c) 11.55 mol Fe 2 O 3 2¢ 8 mol SO 2 2 mol Fe 2 O 3 ≤ = 6.20 mol SO 2 (d) 10.512 mol FeS 2 2¢ 8 mol SO 2 ≤ a 64.07 g b = 65.6 g SO 4 mol FeS 2 mol 2 (e) 140.6 g SO 2 2a 1 mol 64.07 g b ¢ 11 mol O 2 8 mol SO 2 ≤ = 0.871 mol O 2 (f) 1221 g Fe 2 O 3 2a 1 mol 159.7 g b ¢ 4 mol FeS 2 ≤ a 120.0 g b = 332 g FeS 2 mol Fe 2 O 3 mol 2 19. (a) Hydrogen Oxygen Hydrogen is the limiting reactant. - 101 -
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Chapter 9

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