Homework Answers
A) As changing from liquid one phase to gas another phase, so physical change
C) The enthalpy for liquid to gas is given so if we reverse the reaction and add a negative symbol in delta H we get the enthalpy value for gas to liquid
D) Given change has a +ve enthalpy change value which means an endothermic reaction
E) System needed heat because endothermic so internal energy increase for system and decrease for surrounding
B) THE Pessure of process is known is correct
FINAL ANSWER = E
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QUESTION 19 Based on the following thermochemical equation, which statement is false? NH3() NH3(g) AH° =...
13. Indicate whether the following statements are true or false. If false, correct the statement so...
13. Indicate whether the following statements are true or false. If false, correct the statement so that it is true. a. A change in enthalpy for exothermic chemical reactions is negative. b. An endothermic reaction is one in which enthalpy is absorbed by the system from the surroundings. c. Condensation of water vapor is an example of an endothermic process. d. Heat, q, and enthalpy, AH, are state functions, meaning they depend on the path taken, and q = AH....
Question 7 (1 point) Given the thermochemical equation O2(g)---> SO3(g) AH= -99.1 kJ/mol, S2(g) + calculate the...
Question 7 (1 point) Given the thermochemical equation O2(g)---> SO3(g) AH= -99.1 kJ/mol, S2(g) + calculate the enthalpy change when 89.6 g of SO2 is converted to SO3. -111 kJ 69.3 kJ O-69.3 kJ -139 kJ 139 kJ
The following thermochemical equation is for the reaction of iron(III) oxide(s) with hydrogen(g) to form iron(s) and wa...
The following thermochemical equation is for the reaction of iron(III) oxide(s) with hydrogen(g) to form iron(s) and water(g). Fe2O3(s) + 3H2(g)— 2Fe(s) + 3H2O(g) AH = 98.8 kJ When 62.3 grams of iron(III) oxide(s) react with excess hydrogen(g), kJ of energy are Hint: An amount of energy is expressed as a positive number. The sign of AH in the thermochemical equation indicates whether the energy is absorbed or evolved. An automobile engine provides 523 Joules of work to push the...
10. Given the thermochemical data below, what is the change in enthalpy when 10.0 g of...
10. Given the thermochemical data below, what is the change in enthalpy when 10.0 g of H, are reacted? N; (g) + 3H2(g) → 2NH, (g): AH = -91.2 kJ (A) -452 kJ (B) +452 kJ (C) -151 kJ (D) -1357 kJ 11. Which of the following is NOT a state function? 1. Heat 2. Change in enthalpy 3. Change in internal energy 4. Change in pressure (A) 1 only (B) 2 only (C) 2 and 3 (D) 1 and...
Question 3 Propane (C3Hg) undergoes combustion according to the following thermochemical equation: C3H8(g) + 5 O2(g)...
Question 3 Propane (C3Hg) undergoes combustion according to the following thermochemical equation: C3H8(g) + 5 O2(g) - 3 CO2(g) + 4H2O(g) AHrxn=-2043.0 kJ Substance Heat of Formation (kJ/mol) CO2(g) -393.5 H2O(g) -241.8 O2(g) 0 C3H8(g) ? Calculate the standard enthalpy of formation of propane C3Hg a. -104.7 kJ/mol O b. +1407.7 kJ/mol O C. -1407.7 kJ/mol O d. +104.7 kJ/mol o e. -4190.7 kJ/mol uestion 4 Consider the evaporation of liquid water to water vapor at 125°C. What is true...
Calculate AU of a gas for a process in which the gas absorbs 29 J of...
Calculate AU of a gas for a process in which the gas absorbs 29 J of heat and does 31 J of work by expanding A. 21 B. 60) C. -60J D. -2J Which of the following statements is not true for an exothermic reaction? A. Heat passes from the reaction system to the surroundings. B. The products have a higher heat content than the reactants. C. The temperature of the reaction system increases D. The enthalpy change for the...
Someone please help solving this asap thanks! 1. Calculate AE and determine whether the process is...
Someone please help solving this asap thanks!
1. Calculate AE and determine whether the process is exothermic or endothermic for the following cases: L. When a chemical reaction produces 90.7 kJ of heat but does no work on its surroundings. il. When combustion of a gas releases 2100U of heat to its surroundings. ii. When 33.05 kd of heat is transferred to the system and 22.0 kJ of work on the surroundings. Iv. When 121 kJ of work is performed...
RULES 1. If reverse equation, change sign of AH value. 2. If double equation, double AH...
RULES 1. If reverse equation, change sign of AH value. 2. If double equation, double AH value. 3. If halve equation, halve AH value. 4. NOTE that as states (solid, liquid, or gas) change, energy is absorbed or released so AH values likewise change. 5. AH' - O for all elements in their most stable form at 1 atm. pressure and 25°C. 6. AH is calculated as ZAHproducts. ZAHreactants. Rearrange the thermochemical equations given to determine the AH value for...
1) Enthalpy changes for the following reactions can be determined: AH=-91.8k N2(g) + 3 H2(g) →...
1) Enthalpy changes for the following reactions can be determined: AH=-91.8k N2(g) + 3 H2(g) → 2 NH (B) 4 NH(B) + 5 O2(g) → 4 NO(g) + 6H2O () H2(g) + O2 (g) → H20 (8) AH = -906.2 kJ AH = -241.8 kJ What is the enthalpy change for the following reaction? % N2(g) + O2(g) → NO(g) 2) Consider the following thermochemical equation: 2CH.(g)+70:(g)4CO2(g)+6H,0(1) AH--3120 kJ If 2.4 L of ethane (C2H6) at STP are reacted with...
42) Which statement is FALSE? A) An exothermic reaction gives heat off heat to the surroundings. B) Enthalpy is the...
42) Which statement is FALSE? A) An exothermic reaction gives heat off heat to the surroundings. B) Enthalpy is the sum of a system's internal energy and the product of pressure and volume change. C) AErxn is a measure of heat. D) AHrxn is the heat of reaction. E) Endothermic has a positive AH. 43) How much energy is required to decompose 765 g of PC13, according to the reaction below? The molar mass of PCl3 is 137.32 g/mol and...
13. Indicate whether the following statements are true or false. If false, correct the statement so that it is true. a. A change in enthalpy for exothermic chemical reactions is negative. b. An endothermic reaction is one in which enthalpy is absorbed by the system from the surroundings. c. Condensation of water vapor is an example of an endothermic process. d. Heat, q, and enthalpy, AH, are state functions, meaning they depend on the path taken, and q = AH....
Question 7 (1 point) Given the thermochemical equation O2(g)---> SO3(g) AH= -99.1 kJ/mol, S2(g) + calculate the enthalpy change when 89.6 g of SO2 is converted to SO3. -111 kJ 69.3 kJ O-69.3 kJ -139 kJ 139 kJ
The following thermochemical equation is for the reaction of iron(III) oxide(s) with hydrogen(g) to form iron(s) and water(g). Fe2O3(s) + 3H2(g)— 2Fe(s) + 3H2O(g) AH = 98.8 kJ When 62.3 grams of iron(III) oxide(s) react with excess hydrogen(g), kJ of energy are Hint: An amount of energy is expressed as a positive number. The sign of AH in the thermochemical equation indicates whether the energy is absorbed or evolved. An automobile engine provides 523 Joules of work to push the...
10. Given the thermochemical data below, what is the change in enthalpy when 10.0 g of H, are reacted? N; (g) + 3H2(g) → 2NH, (g): AH = -91.2 kJ (A) -452 kJ (B) +452 kJ (C) -151 kJ (D) -1357 kJ 11. Which of the following is NOT a state function? 1. Heat 2. Change in enthalpy 3. Change in internal energy 4. Change in pressure (A) 1 only (B) 2 only (C) 2 and 3 (D) 1 and...
Question 3 Propane (C3Hg) undergoes combustion according to the following thermochemical equation: C3H8(g) + 5 O2(g) - 3 CO2(g) + 4H2O(g) AHrxn=-2043.0 kJ Substance Heat of Formation (kJ/mol) CO2(g) -393.5 H2O(g) -241.8 O2(g) 0 C3H8(g) ? Calculate the standard enthalpy of formation of propane C3Hg a. -104.7 kJ/mol O b. +1407.7 kJ/mol O C. -1407.7 kJ/mol O d. +104.7 kJ/mol o e. -4190.7 kJ/mol uestion 4 Consider the evaporation of liquid water to water vapor at 125°C. What is true...
Calculate AU of a gas for a process in which the gas absorbs 29 J of heat and does 31 J of work by expanding A. 21 B. 60) C. -60J D. -2J Which of the following statements is not true for an exothermic reaction? A. Heat passes from the reaction system to the surroundings. B. The products have a higher heat content than the reactants. C. The temperature of the reaction system increases D. The enthalpy change for the...
Someone please help solving this asap thanks!
1. Calculate AE and determine whether the process is exothermic or endothermic for the following cases: L. When a chemical reaction produces 90.7 kJ of heat but does no work on its surroundings. il. When combustion of a gas releases 2100U of heat to its surroundings. ii. When 33.05 kd of heat is transferred to the system and 22.0 kJ of work on the surroundings. Iv. When 121 kJ of work is performed...
RULES 1. If reverse equation, change sign of AH value. 2. If double equation, double AH value. 3. If halve equation, halve AH value. 4. NOTE that as states (solid, liquid, or gas) change, energy is absorbed or released so AH values likewise change. 5. AH' - O for all elements in their most stable form at 1 atm. pressure and 25°C. 6. AH is calculated as ZAHproducts. ZAHreactants. Rearrange the thermochemical equations given to determine the AH value for...
1) Enthalpy changes for the following reactions can be determined: AH=-91.8k N2(g) + 3 H2(g) → 2 NH (B) 4 NH(B) + 5 O2(g) → 4 NO(g) + 6H2O () H2(g) + O2 (g) → H20 (8) AH = -906.2 kJ AH = -241.8 kJ What is the enthalpy change for the following reaction? % N2(g) + O2(g) → NO(g) 2) Consider the following thermochemical equation: 2CH.(g)+70:(g)4CO2(g)+6H,0(1) AH--3120 kJ If 2.4 L of ethane (C2H6) at STP are reacted with...
42) Which statement is FALSE? A) An exothermic reaction gives heat off heat to the surroundings. B) Enthalpy is the sum of a system's internal energy and the product of pressure and volume change. C) AErxn is a measure of heat. D) AHrxn is the heat of reaction. E) Endothermic has a positive AH. 43) How much energy is required to decompose 765 g of PC13, according to the reaction below? The molar mass of PCl3 is 137.32 g/mol and...
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