Homework Answers
9. It is given that 80.10 g of sample releases 28,096 kJ of heat
We need to calculate the fuel value of this blend in kJ/g
The given weight is of the synthetic blend of fuel.
We should calculate the heat released per gram of the fuel blend
If 80.10 grams of sample releases 28,096 kJ of heat then
1 gram of sample release
28,096 kJ / 80.10 grams = 350.76 kJ/g
Thus the required value of this fuel blend is 370.76 kJ/g
10. The given reaction is exothermic reaction
Given that the H value of the
reaction is -1,269.8 kJ
A negative H value indicates
that the products of the reaction has less energy than the
reactants. This means the reactants loose their energy to the
surroundings as heat. When the energy is given out by the
reactants, it is the exothermic reaction and hence the given
reaction is exothermic reaction.
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14K 8.3 Heat Energy and Chemical Reactions 9. A synthetic fuel blend is tested by bomb...
Unit 8.3: Energy in Chemical Reactions Item 10 Part A Calculate the enthalpy change for the...
Unit 8.3: Energy in Chemical Reactions Item 10 Part A Calculate the enthalpy change for the reaction NHC(s) - NH()+HCl() from the following equations H2(g) + Cl (9) HCI(9) AH -92 kJ N()+4H()+Clo) 2NHC.) AH = -631 kJ N()+3H (0) - 2NH,(9) AH = -296 kJ Express your answer as an integer. A : ? + kJ - 243 Submit X Incorrect; Try Again; 4 attempts remaining Provide Feedback
Answer both question below. Show all work and chemical equations. 1. Using the information below answer...
Answer both question below. Show all work and chemical equations. 1. Using the information below answer questions a to c. Ca sº = 41.6 J/mol K CaCO3 (s) sº = 91.7 J/mol K AH° = -1207.6 kJ/mol O2 Sº = 205.2 J/mol K Cao (s) S0 = 38.1 J/mol K AH = -634.9 kJ/mol CO2 (g) sº = 213.8 J/mol K AH° = -393.5 kJ/mol AH° O2 = 0 kJ/mol AH° Ca= 0 kJ/mol a) Calculate AS9rxn and AH°rxn for...
Homework Thermochemistry Name: 1. Calculate the mass of O that is produced by photosynthesis when 2.49...
Homework Thermochemistry Name: 1. Calculate the mass of O that is produced by photosynthesis when 2.49 x 109 kJ of solar energy is consumed by the following reaction: 6 H20 (1) + 6 CO2 (g) - C&H 20(s) + 6 02 (g) ; AH-2803 kJ 2. Given the following thermochemical equation, what amount of energy is absorbed/given off when 255 g of CuO is reacted. 2 Cu20 (s) - 4 Cu (s) + O2(g) : AH = 333.8 kJ 3....
Bomb calorimetry is a technique used to determine the enthalpy of combustion, usually in O2, of...
Bomb calorimetry is a technique used to determine the enthalpy of combustion, usually in O2, of a chemical species. A known amount of compound is placed inside a fixed volume container that is, in turn, filled with oxygen at a high enough pressure to ensure complete combustion. The fixed-volume container (the 'bomb') is then inserted into a bucket containing a precisely known volume of water. The oxygen and compound are ignited, and the temperature change in the water is recorded....
25) Objects can possess energy as (a) endothermic energy (b) potential energy (c) kinetic energy A) a only B) b...
25) Objects can possess energy as (a) endothermic energy (b) potential energy (c) kinetic energy A) a only B) b only C) c only D) bandc E) a and 33) The value of AH' for the reaction below is - 790 kl. The enthalpy change accompanying the reaction of 0.95 g of Sis_ k 33) 25 (s) + 302 (9) -2503 (9) A) 12 B) 23 C) -23 D) - 790 E) -12 34) The value of AH' for the...
15. Classify each of the following chemical changes as an exothermic or endothermic reactions. a. A...
15. Classify each of the following chemical changes as an exothermic or endothermic reactions. a. A reaction released 550 J. b. The energy level of the products is higher than that of the reactants c. The metabolism of glucose in the body provides energy. d. The energy level of the products is lower than that of the reactants. e. In the body the synthesis of proteins requires energy. f. CH(8) 202(g) Co,(8) + 2H,O(g) + 802 kJ g. Ca(OH)2(s) +65.3...
1. The dimensions of the SI unit of energy, the Joule (J), are A. K B....
1. The dimensions of the SI unit of energy, the Joule (J), are A. K B. kg m s C. kg m2 s-2 D. kg m-1 s-2 E. kg m2 s-1 2. Natural gas, or methane, is an important fuel. Combustion of one mole of methane releases 802.3 kilojoules of energy. How much energy does that represent in kilocalories? A. 3.36×103 kcal B. 3.357 kcal C. 191.8 kcal D. 0.192 kcal E. 1.918×105 kcal 3. What is the change in...
d) Based on the following chemical equation, answer the following questions. H2S (g) + O2(g) 28...
d) Based on the following chemical equation, answer the following questions. H2S (g) + O2(g) 28 (g) + 2H20 (g) What happens to i) [H20] if O2 is added. ii) [H2S] if sulfur is added. (2 marks) e) Explain if the volume of the reaction vessel should be increased or decreased to increase the yields of the products. (i) CaCO3 (5) - - CaO(s) + CO2 (g) (ii) S(s) + 3F2 (g) SF6 (g) (2 marks) 1) Specify how and...
CHEM 212 Practice Sheet la) Sketch an energy diagram for a chemical reaction that is exothermic...
CHEM 212 Practice Sheet la) Sketch an energy diagram for a chemical reaction that is exothermic (AH--200 kJ/mol. The reaction is single-step and has an activation energy of 100 kJ/mol. 1b) Now, draw an energy diagram for the same chemical reaction upon addition of a catalyst. 2) At 1000 K, K, -1.85 for the reaction SO, (g) + 0(8) SO, (g) a) Write an expression for the equilibrium constant, K b) What is the value of K, for the reaction...
QUESTION 9 If two reactions are coupled, then 2. A product of one reaction is a...
QUESTION 9 If two reactions are coupled, then 2. A product of one reaction is a reactant of the other, and the overall process is product-favored. b. A product of one reaction is a reactant of the other, and the overall process is reactant-favored C. The heat released from an exothermic reaction is used in an endothermic reaction. The Gibbs free energy released from a product-favored reaction is released to the surroundings. causing an increase in entropy for a second...
Unit 8.3: Energy in Chemical Reactions Item 10 Part A Calculate the enthalpy change for the reaction NHC(s) - NH()+HCl() from the following equations H2(g) + Cl (9) HCI(9) AH -92 kJ N()+4H()+Clo) 2NHC.) AH = -631 kJ N()+3H (0) - 2NH,(9) AH = -296 kJ Express your answer as an integer. A : ? + kJ - 243 Submit X Incorrect; Try Again; 4 attempts remaining Provide Feedback
Answer both question below. Show all work and chemical equations. 1. Using the information below answer questions a to c. Ca sº = 41.6 J/mol K CaCO3 (s) sº = 91.7 J/mol K AH° = -1207.6 kJ/mol O2 Sº = 205.2 J/mol K Cao (s) S0 = 38.1 J/mol K AH = -634.9 kJ/mol CO2 (g) sº = 213.8 J/mol K AH° = -393.5 kJ/mol AH° O2 = 0 kJ/mol AH° Ca= 0 kJ/mol a) Calculate AS9rxn and AH°rxn for...
Homework Thermochemistry Name: 1. Calculate the mass of O that is produced by photosynthesis when 2.49 x 109 kJ of solar energy is consumed by the following reaction: 6 H20 (1) + 6 CO2 (g) - C&H 20(s) + 6 02 (g) ; AH-2803 kJ 2. Given the following thermochemical equation, what amount of energy is absorbed/given off when 255 g of CuO is reacted. 2 Cu20 (s) - 4 Cu (s) + O2(g) : AH = 333.8 kJ 3....
Bomb calorimetry is a technique used to determine the enthalpy of combustion, usually in O2, of a chemical species. A known amount of compound is placed inside a fixed volume container that is, in turn, filled with oxygen at a high enough pressure to ensure complete combustion. The fixed-volume container (the 'bomb') is then inserted into a bucket containing a precisely known volume of water. The oxygen and compound are ignited, and the temperature change in the water is recorded....
25) Objects can possess energy as (a) endothermic energy (b) potential energy (c) kinetic energy A) a only B) b only C) c only D) bandc E) a and 33) The value of AH' for the reaction below is - 790 kl. The enthalpy change accompanying the reaction of 0.95 g of Sis_ k 33) 25 (s) + 302 (9) -2503 (9) A) 12 B) 23 C) -23 D) - 790 E) -12 34) The value of AH' for the...
15. Classify each of the following chemical changes as an exothermic or endothermic reactions. a. A reaction released 550 J. b. The energy level of the products is higher than that of the reactants c. The metabolism of glucose in the body provides energy. d. The energy level of the products is lower than that of the reactants. e. In the body the synthesis of proteins requires energy. f. CH(8) 202(g) Co,(8) + 2H,O(g) + 802 kJ g. Ca(OH)2(s) +65.3...
d) Based on the following chemical equation, answer the following questions. H2S (g) + O2(g) 28 (g) + 2H20 (g) What happens to i) [H20] if O2 is added. ii) [H2S] if sulfur is added. (2 marks) e) Explain if the volume of the reaction vessel should be increased or decreased to increase the yields of the products. (i) CaCO3 (5) - - CaO(s) + CO2 (g) (ii) S(s) + 3F2 (g) SF6 (g) (2 marks) 1) Specify how and...
CHEM 212 Practice Sheet la) Sketch an energy diagram for a chemical reaction that is exothermic (AH--200 kJ/mol. The reaction is single-step and has an activation energy of 100 kJ/mol. 1b) Now, draw an energy diagram for the same chemical reaction upon addition of a catalyst. 2) At 1000 K, K, -1.85 for the reaction SO, (g) + 0(8) SO, (g) a) Write an expression for the equilibrium constant, K b) What is the value of K, for the reaction...
QUESTION 9 If two reactions are coupled, then 2. A product of one reaction is a reactant of the other, and the overall process is product-favored. b. A product of one reaction is a reactant of the other, and the overall process is reactant-favored C. The heat released from an exothermic reaction is used in an endothermic reaction. The Gibbs free energy released from a product-favored reaction is released to the surroundings. causing an increase in entropy for a second...
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