chem-2045-ch-9-hw

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Please complete this homework – please show all work, and explain answers. All work must be shown step by step. Please don’t forget the End of Chapter questions at the bottom.

Thank you!

1.Which one of the following are endothermic processes?

  1. ice is melting at a constant temperature
  2. water is freezing at a constant temperature
  3. water is boiling at a constant temperature
  4. water is mixed with solid sodium hydroxide: the temperature increases.
  5. water is mixed with solid ammonium chloride: the temperature decreases.
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2.Which one of the following are exothermic processes?

  1. ice is melting at a constant temperature
  2. water is freezing at a constant temperature
  3. water vapor is condensing at a constant temperature
  4. water is mixed with solid sodium hydroxide: the temperature increases.
  5. water is mixed with solid ammonium chloride: the temperature decreases.
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3.Which of the following is not true about an exothermic reaction?

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4.Which of the following statements is incorrect?

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5.A 75.0 g piece of aluminum (specific heat capacity 0.900 J/oC g), heated to 125oC is put into an insulated container with 255 mL of water at 0oC. What will be the final temperature (oC) of the water? The specific heat of water is 4.18 J/goC.

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6.In a coffee cup calorimeter, 100.0 mL of 1.00 M NaOH and 200.0 mL of 0.80 M HCl are mixed at 25.0oC. After the reaction, the temperature is 29.5 oC. Assuming all solutions have a density of 1.00 g/cm3 and a specific heat capacity of 4.18 J/oC g, what is the enthalpy change (kJ) for the balanced reaction?

HCl(aq) + NaOH(aq) => NaCl(aq) + H2O(l)

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7.When 2.500 g of sulfur was burned completely in oxygen to form SO2(g), the temperature of a bomb calorimeter with the heat capacity 3.559kJ/oC/was raised from 22.00oC to 28.55oC. Calculate Ho (kJ) for the reaction per mole of SO2 formed. −296.1.

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8.Which of the following equations represents a reaction that provides the heat of formation of hydroxylamine (NH2OH)?

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9.How much heat in kJ is produced by the combustion of 155 g of ethanol (use Tab 9.2)?

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10.How much heat in kJ is produced by the oxidation of 18.6 g of Mn?

3 Mn(s) + 2 O2(g) => Mn3O4(s) ΔHo = -1388 kJ

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Flag this QuestionQuestion 111 pts

11.How much heat in kJ is produced in formation 25.0 g of titanium dioxide?

TiCl4(g) + 2 H2O(g) => TiO2(s) + 4 HCl ΔHo = -67 kJ

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12.How much heat in kJ is produced when 25 g of Fe3O4 reacts with excess Al?

3 Fe3O4(s) + 8 Al(s) => 4 Al2O3(s) + 9 Fe(s) ΔHo = -3347.58 kJ

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12.Use the given standard enthalpies of formation to determine the heat of reaction of the following reaction:

2 C4H10O2(g) + 11 O2(g) => 8 CO2(g) + 10 H2O(g)

ΔHof C45H10O2(g) = -426.0 kJ/mol

Δ Hof CO2(g) = -393.5 kJ/mol
ΔHof H2O(g) = -241.8 kJ/mol

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Flag this QuestionQuestion 142 pts

13.Use the given standard enthalpies of formation to determine the heat of reaction of the following reaction:

2 C5H10O(g) + 19 O2(g) => 10 CO2(g) + 10 H2O(g)

ΔHof C5H10O(g) = -232.11 kJ/mol

Δ Hof CO2(g) = -393.5 kJ/mol

ΔHof H2O(g) = -241.8 kJ/mol

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Flag this QuestionQuestion 151 pts

14.Use the given bond enthalpy data to estimate the Ho (kJ) for the following reaction. (C – H = 414 kJ, H – F = 565 kJ, C – Cl = 331 kJ, C – F = 439 kJ, F – F = 157.8 KJ).

CH3Cl(g) + F2(g) =>CH2FCl(g) + HF(g)

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Flag this QuestionQuestion 161 pts

15.Using the following bond energies and the heat of reaction for the reaction, calculate the average bond energy of Cl – F in ClF5. (F – F = 155; Cl – Cl = 243).

5 F2(g) + Cl2(g) =>2 ClF5(g) ΔHo = -509.6 kJ

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Flag this QuestionQuestion 1715 pts


PLEASE DO NOT FORGET TO COMPLETE BELOW — use this link (no log-in required): https://openstax.org/books/chemistry-atoms-first-2e/pages/1-introduction on the Left hand side search for Ch 9, then exercises

*********************************Solve the following AFTER-THE-CHAPTER exercises listed below. Show your work where necessary. You do not need to rewrite the questions.

Chapter 9: 16; 22; 24; 40; 44; 64; 68;78;84;89; 105

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