44 using the following thermochemical equations ca s

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44. Using the following thermochemical equations Ca (s) + 2C (graphite) → CaC 2 (s) ∆H o = -59.8 kJ Ca (s) + ½ O 2 (g) → CaO (s) ∆H o = -635.09 kJ CaO (s) + H 2 O (l) → Ca(OH) 2 (aq) ∆H o = -653.1 kJ C 2 H 2 (g) + 5 / 2 O 2 (g) → 2CO 2 (g) + H 2 O (l) ∆H o = -1300 kJ C (graphite) + O 2 (g) → CO 2 (g) ∆H o = -393.509 kJ Find ∆H o for CaC 2 (s) + 2H 2 O (l) → Ca(OH) 2 (aq) + C 2 H 2 (g)
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45. The following thermochemical equations can be written for the oxides of iron: Fe (s) + ½ O 2 (g) → FeO (s) ∆H o = -272.0 kJ 3Fe (s) + 2O 2 (g) → Fe 3 O 4 (s) ∆H o = -1118.4 kJ Fin d ∆H o for 4FeO (s) → Fe (s) + Fe 3 O 4 (s) 46. Find the heat of reaction for CH 4 (g) + 4F 2 (g) → CF 4 (g) + 4HF (g) ∆H o f (CH 4 ) = -74.81 kJ/mol ∆H o f (CF 4 ) = -925 kJ/mol ∆H o f (HF) = -271.1 kJ/mol ∆H o f (F 2 ) = 0.00 kJ/mol 47. Find the heat of reaction for 2Fe 3 O 4 (s) + ½ O 2 (g) → 3Fe 2 O 3 (s). ∆H o f (Fe 2 O 3 ) = -824.2 kJ/mol ∆H o f (Fe 3 O 4 ) = -1118.4 kJ/mol ∆H o f (O 2 ) = 0.00 kJ/mol
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48. Using the following equation: 2 NaOH + H 2 SO 4 → 2 H 2 O + Na 2 SO 4 How many grams of sodium sulfate will be formed if you start with 200.0 grams of sodium hydroxide and you have an excess of sulfuric acid? 49. Using the following equation: Pb(SO 4 ) 2 + 4 LiNO 3 → Pb(NO 3 ) 4 + 2 Li 2 SO 4 How many grams of lithium nitrate will be needed to make 250.0 grams of lithium sulfate if you have an adequate amount of lead (IV) sulfate to do the reaction?
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50. Balance the following chemical reactions: a) Fe + O 2 Fe 3 O 4 b) Sr + O 2 SrO c) Sn + NaOH Na 2 SnO 2 + H 2 d) K + Br 2 KBr e) C 8 H 18 + O 2 CO 2 + H 2 O f) Sb + I 2 SbI 3 g) COCl 2 + H 2 O HCl + CO 2 h) CS 2 + O 2 CO 2 + SO 2 i) H 2 SO 4 + NaCN HCN + Na 2 SO 4 j) KClO 3 KCl + O 2 k) H 2 + F 2 HF l) BaCl 2 + KIO 3 Ba(IO 3 ) 2 + KCl
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51. Consider the reaction I 2 O 5 (g) + 5 CO(g) → 5 CO 2 (g) + I 2 (g) a) 80.0 grams of I 2 O 5 reacts with 28.0 grams of carbon monoxide, CO. Determine the theoretical yield of iodine, I 2 . b) What is the limiting reactant? c) What is the percent yield for this reaction if 0.160 moles of I 2 was actually produced?
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52. How many moles of sodium are 3.896 x 10 24 atoms of sodium? 53. How many molecules of CO 2 are in 2.58 moles of CO 2 ? 54. What is the mass in grams for 0.825 moles H 2 O? 55. How many oxygen atoms are contained in 46.50 g NO 2 ?
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