Homework Answers
Definition: Standard enthalpy formation is the change in enthalpy when 1 mole of compound is formed from its constituent elements in their standard states.
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Question 17 1 pts 17. According to the definition of standard enthalpy of formation, AH, which...
16. Given the following reactions CaCO3 (s) → CaO (s) + CO2 (g) ΔH°=178.1 kJ
16. Given the following reactions CaCO3 (s) → CaO (s) + CO2 (g) ΔH°=178.1 kJ C(s, graphite) + O2 (g) → CO2 (g) ΔH°=-393.5 k According to Hess's Law, what is the enthalpy of the reaction (k) for CaCO3(s) → CaO (s)+C(s. graphite) +O2(g)? -571.6 -215.4 5716 215.4 701.2 Question 17 According to the definition of standard enthalpy of formation, ΔH°, which of the following's ΔH° is zero? Question 18Given the data in the table below, calculate the ΔH°rxn (kJ) for the reaction 4NH3(g)+5O2 (g) → 4NO (g)+6H2O (I)
Question 9 For which of these reactions will the difference between AH° and AEº be the...
Question 9 For which of these reactions will the difference between AH° and AEº be the greatest? NO(g) + O3(g) —+NO2(g) + O2(g) 4NH3(g) + 5O2(g) + 4NO(g) + 6H2O(g) 2C2H6(g) + 702(g) + 4CO2(g) + 6H20(1) 2H2O2(1) +2H2O(1) + O2(g) 0 CaCO3(s) CaO(s) +CO2(8)
A scientist measures the standard enthalpy change for the following reaction to be -2847.0 kJ: 2C2H6(g)...
A scientist measures the standard enthalpy change for the following reaction to be -2847.0 kJ: 2C2H6(g) + 7 02(g) —4CO2(g) + 6H2O(g) Based on this value and the standard enthalpies of formation for the other substances, the standard enthalpy of formation of CzH6(g) is kJ/mol. A scientist measures the standard enthalpy change for the following reaction to be -15.0 kJ : Ca(OH)2(aq) + 2 HCl(aq) +CaCl(s) + 2 H20(1) Based on this value and the standard enthalpies of formation for...
3. (14 pts.) The standard molar enthalpy of formation of Fe,Oxs is AH = -8242 kJ/mol,...
3. (14 pts.) The standard molar enthalpy of formation of Fe,Oxs is AH = -8242 kJ/mol, and the standard molar enthalpy of formation of SO2(g) is AH = -296.8 kJ/mol (both at 298 K). Use this information, along with the standard molar enthalpy change of the following reaction at 298K, 2 FeS21s) + 11/2O2(g) → Fe2O3 + 4 SO2(g) AH = -1655 kJ/mol To determine the standard molar enthalpy change of the reaction shown below are 298 K: Fe(s) +...
7- (15 pts) Calculate the standard enthalpy of formation of CS2 (1) given that a. C(s)...
7- (15 pts) Calculate the standard enthalpy of formation of CS2 (1) given that a. C(s) + O2(g) + CO2(g) b. S(s) + O2(g) → SO2(e) C. CS2() + 302(g) → CO2(g) + ' 250 (6) AH° = -393.5 kJ/mol AH° = -296.4 kJ/mol AH° = -1073.6 kj/mol (the standard state of the element Sulfur is S(s))
Calculate the standard enthalpy of formation of solid magnesium sulfide (MS) using the following thermochemical information:...
Calculate the standard enthalpy of formation of solid magnesium sulfide (MS) using the following thermochemical information: 2 Mg(s) + O2(9) = 2 M90(s) 3 Mg(s) + 5O2(g) = Mg(s) + 2 Mg(s) SO2(g) = S(s) + O2(9) AH = -1203.4 la AH -1504.6 kJ AH = +296.8 kJ AH = 0
Question 17 (1 point) What is the reaction for the standard enthalpy of formation for HCl(g)?...
Question 17 (1 point) What is the reaction for the standard enthalpy of formation for HCl(g)? 1/2 H2(1) + 1/2012(8) - HCI(1) H(aq) + Cl(aq) - HCl(g) 1/2 H2(g) + 1/2012(1) - HCl(s) NH3(g) + Cl2(8) -- NH2Cl(g) + HCl(g) 1/2 H2(g) + 1/2Cl2(8) -- HCl(g) Question 18 (1 point) A piece of iron (mass = 25.0 g) at 398 K is placed in a ste
Can you please show detail work for understanding< Thanks 1. What is the enthalpy of formation...
Can you please show detail work for understanding< Thanks 1. What is the enthalpy of formation ( Δ H∘ f, in kJmol‐1)of O3(g)? 2. How much heat must be absorbed by 310 grams of water to raise its temperature by 23 K? Heat of water is 4.184 J/g*K. 3. Find the amount of heat energy required to raise the temperature of 12 mL of liquid water by 6°C 4. 4NH3(g)+ 5O2(g) 4NO(g)+ 6H2O(l) Calculate H. Hf(kJ/mol) H2O=‐228, NO=88, NH3=‐55, O2=...
PLEASEEE HELPP ASAP 7- (15 pts) Calculate the standard enthalpy of formation of CS,() given that...
PLEASEEE HELPP ASAP
7- (15 pts) Calculate the standard enthalpy of formation of CS,() given that AH 393.5 kJ/mol AH- 296.4 kj/mol a. C(s) Oz(g) COlg) b. S(s) O,(g). SOlg) c. CS)()30 (g) CO,(B ) + 2SO;(g) + AH° -1073.6 kj/mol (the standard state of the element Sulfur is S(s)
Question 13 4 pts Which of the following does not have a standard enthalpy of formation...
Question 13 4 pts Which of the following does not have a standard enthalpy of formation equal to zero at 25 °C and 1.0 atm? 0 Ti (s) O S8 (s) O H2 (g) o They all have standard enthalpy of zero O HCl (g)
Question 9 For which of these reactions will the difference between AH° and AEº be the greatest? NO(g) + O3(g) —+NO2(g) + O2(g) 4NH3(g) + 5O2(g) + 4NO(g) + 6H2O(g) 2C2H6(g) + 702(g) + 4CO2(g) + 6H20(1) 2H2O2(1) +2H2O(1) + O2(g) 0 CaCO3(s) CaO(s) +CO2(8)
A scientist measures the standard enthalpy change for the following reaction to be -2847.0 kJ: 2C2H6(g) + 7 02(g) —4CO2(g) + 6H2O(g) Based on this value and the standard enthalpies of formation for the other substances, the standard enthalpy of formation of CzH6(g) is kJ/mol. A scientist measures the standard enthalpy change for the following reaction to be -15.0 kJ : Ca(OH)2(aq) + 2 HCl(aq) +CaCl(s) + 2 H20(1) Based on this value and the standard enthalpies of formation for...
3. (14 pts.) The standard molar enthalpy of formation of Fe,Oxs is AH = -8242 kJ/mol, and the standard molar enthalpy of formation of SO2(g) is AH = -296.8 kJ/mol (both at 298 K). Use this information, along with the standard molar enthalpy change of the following reaction at 298K, 2 FeS21s) + 11/2O2(g) → Fe2O3 + 4 SO2(g) AH = -1655 kJ/mol To determine the standard molar enthalpy change of the reaction shown below are 298 K: Fe(s) +...
7- (15 pts) Calculate the standard enthalpy of formation of CS2 (1) given that a. C(s) + O2(g) + CO2(g) b. S(s) + O2(g) → SO2(e) C. CS2() + 302(g) → CO2(g) + ' 250 (6) AH° = -393.5 kJ/mol AH° = -296.4 kJ/mol AH° = -1073.6 kj/mol (the standard state of the element Sulfur is S(s))
Calculate the standard enthalpy of formation of solid magnesium sulfide (MS) using the following thermochemical information: 2 Mg(s) + O2(9) = 2 M90(s) 3 Mg(s) + 5O2(g) = Mg(s) + 2 Mg(s) SO2(g) = S(s) + O2(9) AH = -1203.4 la AH -1504.6 kJ AH = +296.8 kJ AH = 0
Question 17 (1 point) What is the reaction for the standard enthalpy of formation for HCl(g)? 1/2 H2(1) + 1/2012(8) - HCI(1) H(aq) + Cl(aq) - HCl(g) 1/2 H2(g) + 1/2012(1) - HCl(s) NH3(g) + Cl2(8) -- NH2Cl(g) + HCl(g) 1/2 H2(g) + 1/2Cl2(8) -- HCl(g) Question 18 (1 point) A piece of iron (mass = 25.0 g) at 398 K is placed in a ste
PLEASEEE HELPP ASAP
7- (15 pts) Calculate the standard enthalpy of formation of CS,() given that AH 393.5 kJ/mol AH- 296.4 kj/mol a. C(s) Oz(g) COlg) b. S(s) O,(g). SOlg) c. CS)()30 (g) CO,(B ) + 2SO;(g) + AH° -1073.6 kj/mol (the standard state of the element Sulfur is S(s)
Question 13 4 pts Which of the following does not have a standard enthalpy of formation equal to zero at 25 °C and 1.0 atm? 0 Ti (s) O S8 (s) O H2 (g) o They all have standard enthalpy of zero O HCl (g)
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