Homework Answers
Enthalpy is a state function. Hence, the value of 
for the reverse reaction will be the same as the forward reaction
but with opposite sign.
Hence,
= 81.4 kJ
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What is the value of AHpxn if the reaction below is reversed? In other words, PCi5 becomes the reactant. Report...
What is the value of ΔHrxn if the reaction below is reversed? In other words, PCl5...
What is the value of ΔHrxn if the reaction below is reversed? In other words, PCl5 becomes the reactant. Report your answer in kJ to 1 decimal place. PCl3(g) + Cl2(g) → PCl5(g); ΔHrxn = -211.4
The standard enthalpy change for the following reaction is 66.4 kJ at 298 K. N2(g) +...
The standard enthalpy change for the following reaction is 66.4 kJ at 298 K. N2(g) + 2 O2(g) 2 NO2(g) AH° = 66.4 kJ What is the standard enthalpy change for this reaction at 298 K? 1/2 N2(g) + O2(g) — NO2(g) Submit Answer
a Using the heats of formation below, calculate the heat of reaction for the following reaction:...
a Using the heats of formation below, calculate the heat of reaction for the following reaction: C2H2(g) + 5/202(2)→ 2C02() +H20() AH® (kJ/mol) C2H2(g) 226.7 O2(g) 0 CO2(g) -393.5 H20(-285.8 kJ Submit b Using the heats of formation below. calculate the heat of reaction for the following reaction: PC13(2) + Cl2(2)→ PC15(e) AH(kJ/mol) PC13(g) -306.4 Cl2(E) 0 PC1s() -398.9
The standard enthalpy change for the following reaction is -704 kJ at 298 K. Al(s) +...
The standard enthalpy change for the following reaction is -704 kJ at 298 K. Al(s) + 3/2 Cl2(g) — AICI3(8) AH° = -704 kJ What is the standard enthalpy change for the reaction at 298 K? 2 AICI3(s) — 2 Al(s) + 3 Cl2(9) kJ The standard enthalpy change for the following reaction is 851 kJ at 298 K. 2 NaOH(s) —— 2 Na(s) + O2(g) + H2(g) AH° = 851 kJ What is the standard enthalpy change for this...
52) Use the standard reaction enthalpies given below to determine AHryn for the tonowe reaction P4()...
52) Use the standard reaction enthalpies given below to determine AHryn for the tonowe reaction P4() + 10 C12(e) → 4PC15(s) Hºrxn = ? Given: PC15(s) → PC13(g) + Cl2(e) AHørxn = +157 kJ P4(B) + 6 Cl2(e) → 4 PC13(g) AH*rxn=-1207 kJ A) -1835 kJ B) -1364 kJ C) -1050. kJ D) -1786 kJ E) -2100. kJ 53) Use the standard reaction enthalpies given below to determine AHørxn for the following reaction 4 SO3(e) — 4 S(s) + 6...
Calculate the enthalpy of the reaction 2NO(g) + O2(g)2NO2(g) Hess's law states that "the heat released or absorbed in a...
Calculate the enthalpy of the reaction 2NO(g) + O2(g)2NO2(g) Hess's law states that "the heat released or absorbed in a chemical process is the same whether the process takes place in one or in several steps." It is important to recall the following rules: given the following reactions and enthalpies of formation: 1. ¢ N2(g) + O2(g)+NO2(g), AH; = 33.2 kJ 2. N2(g) + O2(g) NO(g), AHB = 90.2 kJ 1. When two reactions are added, their enthalpy values are...
Which of the following statements is false concerning the reaction of hydrogen gas and oxygen gas given below? H2(g)+1...
Which of the following statements is false concerning the reaction
of hydrogen gas and oxygen gas given below?
H2(g)+1/2O2(g)>H2O
Which of the following statements is false concerning the reaction of hydrogen gas and oxygen gas given below? H2(g) +029) - H20(1; AH = -285.8 kJ Select one: a. For the reaction H2(g) + O2(g) - H2O(g), AH is not equal to -285 b. If the equation is reversed, AH becomes +285.8 kJ. If the equation is multiplied by 2, AH...
Need help with #6,7&9 to make sure I did it right. Will rate high if it...
Need help with #6,7&9 to make sure I
did it right. Will rate high if it is correct! Thank you.
6. Use given data to calculate the standard free- energy change for the reaction Pa(g) + 6 Cl2(g) → 4 PC13(g) at 298 K. (ii) What is AGº for the reverse of this reaction? PA(g) Cl2(g) PC13(g) 24.4 -299.6 kJ/mol AGE 9. Calculate AG at 298 K for a mixture of 2.0 atm N2, 3.0 atm H2, and 0.50 atm...
help help help pls! 17. The value of AH° for the reaction below is -790 kJ/mol....
help help help pls!
17. The value of AH° for the reaction below is -790 kJ/mol. What is the enthalpy change accompanying when 0.95 g of S is completely reacted? 2S (s)302 (g) -2SO3 (g) 18. What is the enthalpy of the following reaction: 4 HCI(g) + O2(g) Given the following thermochemical equations: H2(g)+Cla(g)-2 HCI(g) 2 H2(s)O2(g)- 2 H20(g) 2 Cl2 +2 H2O (g)? AH -185 kJ AH-483.7 kJ
21. Calculate the energy of a photon whose wavelength is 447 nm 8 pts each 22....
21. Calculate the energy of a photon whose wavelength is 447 nm 8 pts each 22. Given the following equation, calculate how much so, gas (in grams) is formed when 25 kJ of heat are released 2 ZnS (s) + 3 02 (6) ► 2 ZnO (s) + 2 SO. (6) AH = -878.2 kJ 23. Given the following reactions, N2 (e) + O2(g) → 2 NO (€) 2 NO (g) + O2(g) → 2 NO2(g) 2 N2O(g) → 2...
The standard enthalpy change for the following reaction is 66.4 kJ at 298 K. N2(g) + 2 O2(g) 2 NO2(g) AH° = 66.4 kJ What is the standard enthalpy change for this reaction at 298 K? 1/2 N2(g) + O2(g) — NO2(g) Submit Answer
a Using the heats of formation below, calculate the heat of reaction for the following reaction: C2H2(g) + 5/202(2)→ 2C02() +H20() AH® (kJ/mol) C2H2(g) 226.7 O2(g) 0 CO2(g) -393.5 H20(-285.8 kJ Submit b Using the heats of formation below. calculate the heat of reaction for the following reaction: PC13(2) + Cl2(2)→ PC15(e) AH(kJ/mol) PC13(g) -306.4 Cl2(E) 0 PC1s() -398.9
The standard enthalpy change for the following reaction is -704 kJ at 298 K. Al(s) + 3/2 Cl2(g) — AICI3(8) AH° = -704 kJ What is the standard enthalpy change for the reaction at 298 K? 2 AICI3(s) — 2 Al(s) + 3 Cl2(9) kJ The standard enthalpy change for the following reaction is 851 kJ at 298 K. 2 NaOH(s) —— 2 Na(s) + O2(g) + H2(g) AH° = 851 kJ What is the standard enthalpy change for this...
52) Use the standard reaction enthalpies given below to determine AHryn for the tonowe reaction P4() + 10 C12(e) → 4PC15(s) Hºrxn = ? Given: PC15(s) → PC13(g) + Cl2(e) AHørxn = +157 kJ P4(B) + 6 Cl2(e) → 4 PC13(g) AH*rxn=-1207 kJ A) -1835 kJ B) -1364 kJ C) -1050. kJ D) -1786 kJ E) -2100. kJ 53) Use the standard reaction enthalpies given below to determine AHørxn for the following reaction 4 SO3(e) — 4 S(s) + 6...
Calculate the enthalpy of the reaction 2NO(g) + O2(g)2NO2(g) Hess's law states that "the heat released or absorbed in a chemical process is the same whether the process takes place in one or in several steps." It is important to recall the following rules: given the following reactions and enthalpies of formation: 1. ¢ N2(g) + O2(g)+NO2(g), AH; = 33.2 kJ 2. N2(g) + O2(g) NO(g), AHB = 90.2 kJ 1. When two reactions are added, their enthalpy values are...
Which of the following statements is false concerning the reaction
of hydrogen gas and oxygen gas given below?
H2(g)+1/2O2(g)>H2O
Which of the following statements is false concerning the reaction of hydrogen gas and oxygen gas given below? H2(g) +029) - H20(1; AH = -285.8 kJ Select one: a. For the reaction H2(g) + O2(g) - H2O(g), AH is not equal to -285 b. If the equation is reversed, AH becomes +285.8 kJ. If the equation is multiplied by 2, AH...
Need help with #6,7&9 to make sure I
did it right. Will rate high if it is correct! Thank you.
6. Use given data to calculate the standard free- energy change for the reaction Pa(g) + 6 Cl2(g) → 4 PC13(g) at 298 K. (ii) What is AGº for the reverse of this reaction? PA(g) Cl2(g) PC13(g) 24.4 -299.6 kJ/mol AGE 9. Calculate AG at 298 K for a mixture of 2.0 atm N2, 3.0 atm H2, and 0.50 atm...
help help help pls!
17. The value of AH° for the reaction below is -790 kJ/mol. What is the enthalpy change accompanying when 0.95 g of S is completely reacted? 2S (s)302 (g) -2SO3 (g) 18. What is the enthalpy of the following reaction: 4 HCI(g) + O2(g) Given the following thermochemical equations: H2(g)+Cla(g)-2 HCI(g) 2 H2(s)O2(g)- 2 H20(g) 2 Cl2 +2 H2O (g)? AH -185 kJ AH-483.7 kJ
21. Calculate the energy of a photon whose wavelength is 447 nm 8 pts each 22. Given the following equation, calculate how much so, gas (in grams) is formed when 25 kJ of heat are released 2 ZnS (s) + 3 02 (6) ► 2 ZnO (s) + 2 SO. (6) AH = -878.2 kJ 23. Given the following reactions, N2 (e) + O2(g) → 2 NO (€) 2 NO (g) + O2(g) → 2 NO2(g) 2 N2O(g) → 2...
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