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Dry ice, CO2(s), is thermodynamically stable at temperatures below -78 °C. The sublimation of dry ice...
What is the entropy change in J/K to the universe when a dry ice (CO2) sculpture...
What is the entropy change in J/K to the universe when a dry ice (CO2) sculpture weighing 386.1 g sublimates on a table top at 21.7 °C and the process occurs reversibly? The temperatures of the dry ice solid and vapour are both -78.5 °C, and the heat of sublimation of dry ice is 21.6 kJ/mol. (2 marks) (Give answer to 3 significant figures.)
17.34. Another decorative "ice" sculpture is carved from dry ice (solid CO2) and held at its...
17.34. Another decorative "ice" sculpture is carved from dry ice (solid CO2) and held at its sublimation point of -78.5 C. What is the entropy change to the universe when the COp sculpture, weighing 389 g, sublimes on a granite tabletop if the temperature of the granite is 12'C and the process occurs reversibly? Assume a final temperature for the CO vapor of -78.5 C. The heat of sublimation of CO2 is 26.1 kJ/mol.
The conversion of solid CO2 ("dry ice") to CO2 gas is product-favored at room temperature. What...
The conversion of solid CO2 ("dry ice") to CO2 gas is product-favored at room temperature. What would be the signs for ΔG, ΔH, and ΔS at room temperature? CO2(s) --> CO2(g) ΔG = (+) ΔH = (+) ΔS = (-) ΔG = (-) ΔH = (+) ΔS = (-) ΔG = (+) ΔH = (+) ΔS = (+) ΔG = (-) ΔH = (+) ΔS = (+) ΔG = (-) ΔH = (-) ΔS = (+)
nupiel 17 Problems 1. Answer the following questions in terms of thermodynamic principles. a. Consider the...
nupiel 17 Problems 1. Answer the following questions in terms of thermodynamic principles. a. Consider the reaction represented below, which is spontaneous at 298 K. CO2(g) + 2 NH3(g) -> CO(NH2)2(s) + H2O(l); AH = -134 kJ i. For the reaction, indicate whether the standard entropy change, AS, is positive, or negative, or zero. Justify your answer. ii. Which factor, the change in enthalpy, AH, or the change in entropy, AS, provides the principal driving force for the reaction at...
16. The sublimation of carbon dioxide at -78°C is given by: CO2(8) = CO2(g) AHsub =...
16. The sublimation of carbon dioxide at -78°C is given by: CO2(8) = CO2(g) AHsub = 25.2 kJ/mol Calculate ASsub when 48.8 g of CO2 sublimes at this temperature AH-26.23 A) 330 J/K B) 143 J/K C) 249 J/K D) 129 J/K E) 79.6 JK 17. A galvanic cell consists of a silver electrode in contact with 0.100 M AgNO3 solution and a magnesium electrode in contact with 0.100 M Mg(NO3)2 solution. Calculate the potential, Ecell, at 25°C. Given: Ag...
3. A chunk of dry ice, CO2(s), weighing 7.4 g is sealed inside a 2 L...
3. A chunk of dry ice, CO2(s), weighing 7.4 g is sealed inside a 2 L soda bottle initially containing 1 bar of air. What is the total pressure in the bottle after the dry ice sublimes and comes to 298.15 K? Enter the correct numerical value to 2.0% precision. Express scientific notation like 4.29E-15 bar
3. A chunk of dry ice, CO2(s), weighing 7.4 g is sealed inside a 2 L...
3. A chunk of dry ice, CO2(s), weighing 7.4 g is sealed inside a 2 L soda bottle initially containing 1 bar of air. What is the total pressure in the bottle after the dry ice sublimes and comes to 298.15 K? Enter the correct numerical value to 2.0% precision. Express scientific notation like 4.29E-15 bar
3. A chunk of dry ice, CO2(s), weighing 7.4 g is sealed inside a 2 L...
3. A chunk of dry ice, CO2(s), weighing 7.4 g is sealed inside a 2 L soda bottle initially containing 1 bar of air. What is the total pressure in the bottle after the dry ice sublimes and comes to 298.15 K? Enter the correct numerical value to 2.0% precision. Express scientific notation like 4.29E-15 bar
1. Ice melts at 0C° with an enthalpy of fusion = 6.01 kJ mol-1 . An...
1. Ice melts at 0C° with an enthalpy of fusion = 6.01 kJ mol-1 . An ice cube with a mass of 20.0g is placed inside an incubator at 40.0C°. Determine the total entropy change (in J/K) of this system. 2. Calculate the total entropy change (in J/K) when 50.0 g of H2 gas initially in a tank at a pressure of 145 psi is withdrawn from the tank under a constant pressure of 23.0 psi at standard room temperature....
Entropy (S) The second factor involved in determining whether or not a process is spontaneous is...
Entropy (S) The second factor involved in determining whether or not a process is spontaneous is the change in randomness or entropy (AS). Entropy is represented by the symbol S. Again, experience can help us understand the relationship between entropy and spontaneous processes. If we look at the two drawings below, we can predict which picture represents the stack of marbles "before" and after they are bumped. We expect the stack of marbles (less random, lower entropy) to be the...
What is the entropy change in J/K to the universe when a dry ice (CO2) sculpture weighing 386.1 g sublimates on a table top at 21.7 °C and the process occurs reversibly? The temperatures of the dry ice solid and vapour are both -78.5 °C, and the heat of sublimation of dry ice is 21.6 kJ/mol. (2 marks) (Give answer to 3 significant figures.)
17.34. Another decorative "ice" sculpture is carved from dry ice (solid CO2) and held at its sublimation point of -78.5 C. What is the entropy change to the universe when the COp sculpture, weighing 389 g, sublimes on a granite tabletop if the temperature of the granite is 12'C and the process occurs reversibly? Assume a final temperature for the CO vapor of -78.5 C. The heat of sublimation of CO2 is 26.1 kJ/mol.
nupiel 17 Problems 1. Answer the following questions in terms of thermodynamic principles. a. Consider the reaction represented below, which is spontaneous at 298 K. CO2(g) + 2 NH3(g) -> CO(NH2)2(s) + H2O(l); AH = -134 kJ i. For the reaction, indicate whether the standard entropy change, AS, is positive, or negative, or zero. Justify your answer. ii. Which factor, the change in enthalpy, AH, or the change in entropy, AS, provides the principal driving force for the reaction at...
16. The sublimation of carbon dioxide at -78°C is given by: CO2(8) = CO2(g) AHsub = 25.2 kJ/mol Calculate ASsub when 48.8 g of CO2 sublimes at this temperature AH-26.23 A) 330 J/K B) 143 J/K C) 249 J/K D) 129 J/K E) 79.6 JK 17. A galvanic cell consists of a silver electrode in contact with 0.100 M AgNO3 solution and a magnesium electrode in contact with 0.100 M Mg(NO3)2 solution. Calculate the potential, Ecell, at 25°C. Given: Ag...
3. A chunk of dry ice, CO2(s), weighing 7.4 g is sealed inside a 2 L soda bottle initially containing 1 bar of air. What is the total pressure in the bottle after the dry ice sublimes and comes to 298.15 K? Enter the correct numerical value to 2.0% precision. Express scientific notation like 4.29E-15 bar
3. A chunk of dry ice, CO2(s), weighing 7.4 g is sealed inside a 2 L soda bottle initially containing 1 bar of air. What is the total pressure in the bottle after the dry ice sublimes and comes to 298.15 K? Enter the correct numerical value to 2.0% precision. Express scientific notation like 4.29E-15 bar
3. A chunk of dry ice, CO2(s), weighing 7.4 g is sealed inside a 2 L soda bottle initially containing 1 bar of air. What is the total pressure in the bottle after the dry ice sublimes and comes to 298.15 K? Enter the correct numerical value to 2.0% precision. Express scientific notation like 4.29E-15 bar
Entropy (S) The second factor involved in determining whether or not a process is spontaneous is the change in randomness or entropy (AS). Entropy is represented by the symbol S. Again, experience can help us understand the relationship between entropy and spontaneous processes. If we look at the two drawings below, we can predict which picture represents the stack of marbles "before" and after they are bumped. We expect the stack of marbles (less random, lower entropy) to be the...
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