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Homework Answers
W = -121 J
Negative because work is done by the gas
Q = +257 J
Positive because system absorbs heat
Use:
Delta E = Q + W
= 257 J - 121 J
= 136 J
Answer: 136 J
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Use the References to access important values if needed for this question. The following information is given for water at 1 atm: AHvap(100.00 °C)= 2.259x109 J/g AHfus(0.000 °C) = 333.5 J/g boiling point = 100.00 °C melting point = 0.000 °C specific heat gas = 2.010 J/g°C specific heat liquid = 4.184 J/g°C A 45.90 g sample of liquid water is initially at 23.50 °C. If the sample is...
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Use the References to access important values if needed for this question. A chunk of silver weighing 18.7 grams and originally at 98.84°C is dropped into an insulated cup containing 82.2 grams of water at 20.61°C. Assuming that all of the heat is transferred to the water, the final temperature of the water is °C. Submit Answer 1 question attempt remaining
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Use the References to access important values if needed for this question. The following thermochemical equation is for the reaction of nitrogen monoxide(g) with hydrogen(g) to form N2(g) and water() 2NO(g) 2H2(g) N2(g)2H20( AH -752 kJ How many grams of NO(g) would have to react to produce 85.0 kJ of energy? grams Submit Answer 1 question attempt remaining
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Use the References to access important values if needed for this question. A gas expands and does 29.0 J of work on the surroundings. At the same time, the gas absorbs 298 J of heat from the surroundings. What is the change in the internal energy of the gas? Submit Answer Unlimited question attempts remaining
(please bold or circle the answer that I need to input) Use the References to access...
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Use the References to access important for this question. A gas expands and does 12.0 J of work on the surroundings...
Use the References to access important for this question. A gas expands and does 12.0 J of work on the surroundings. At the same time, the gas absorbs 216 ) of heat from the surroundings. What is the change in the internal energy of the gas? Submit Answer 1 question attempt remaining
Use the References to access important values if needed for this question. A gas expands and...
Use the References to access important values if needed for this question. A gas expands and does 60.9 J of work on the surroundings. At the same time, the gas absorbs 217 J of heat from the surroundings. What is the change in the internal energy of the gas? Submit ApS
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PLEASE ANSWER ALL 3 QUESTIONS on entropy change and SHOW WORK?!
Use the References to access important values if needed for this question. For aluminum, Al, the heat of vaporization at its normal boiling point of 2467 °C is 284.1 kJ/mol. The entropy change when 1.85 moles of Al vapor condenses at 2467 °C, 1 atm is J/K. Submit Answer Retry Entire Group 9 more group attempts remaining Use the References to access important values if needed for this question....
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Use the References to access important values if heededor A chemical reaction is run in which the surroundings are cooled by 300 J, and 272 J of work is done on the system. Calculate the change in the internal energy of the chemical system. AE = Submit Answer Retry Entire Group 4 more group attempts remaining
A gas is compressed and during this process the surroundings do 43.3 J of work on...
A gas is compressed and during this process the surroundings do 43.3 J of work on the gas. At the same time, the gas absorbs 281 J of heat from the surroundings. What is the change in the internal energy of the gas? Submit Answer 1 question attempt remaining
(please bold or circle the
answer that I need to input)
Use the References to access important values if needed for this question. The following information is given for water at 1 atm: AHvap(100.00 °C)= 2.259x109 J/g AHfus(0.000 °C) = 333.5 J/g boiling point = 100.00 °C melting point = 0.000 °C specific heat gas = 2.010 J/g°C specific heat liquid = 4.184 J/g°C A 45.90 g sample of liquid water is initially at 23.50 °C. If the sample is...
(please bold or circle the
answer that I need to input)
Use the References to access important values if needed for this question. A chunk of silver weighing 18.7 grams and originally at 98.84°C is dropped into an insulated cup containing 82.2 grams of water at 20.61°C. Assuming that all of the heat is transferred to the water, the final temperature of the water is °C. Submit Answer 1 question attempt remaining
(please bold or circle the
answer that I need to input)
Use the References to access important values if needed for this question. The following thermochemical equation is for the reaction of nitrogen monoxide(g) with hydrogen(g) to form N2(g) and water() 2NO(g) 2H2(g) N2(g)2H20( AH -752 kJ How many grams of NO(g) would have to react to produce 85.0 kJ of energy? grams Submit Answer 1 question attempt remaining
Use the References to access important values if needed for this question. A gas expands and does 29.0 J of work on the surroundings. At the same time, the gas absorbs 298 J of heat from the surroundings. What is the change in the internal energy of the gas? Submit Answer Unlimited question attempts remaining
(please bold or circle the
answer that I need to input)
Use the References to access important values if needed for this question. Given the standard enthalpy changes for the following two reactions: (1) 2Pb(s) + O2(g)—2PbO(s) AH° = -434.6 kJ (2) 2Zn(s) + O2(g)—>2ZnO(s) AH° = -696.6 kJ what is the standard enthalpy change for the reaction: (3) PbO(s) + Zn(s)—>Pb(s) + ZnO(s) AH° = ? kJ Submit Answer 1 question attempt remaining
Use the References to access important for this question. A gas expands and does 12.0 J of work on the surroundings. At the same time, the gas absorbs 216 ) of heat from the surroundings. What is the change in the internal energy of the gas? Submit Answer 1 question attempt remaining
Use the References to access important values if needed for this question. A gas expands and does 60.9 J of work on the surroundings. At the same time, the gas absorbs 217 J of heat from the surroundings. What is the change in the internal energy of the gas? Submit ApS
PLEASE ANSWER ALL 3 QUESTIONS on entropy change and SHOW WORK?!
Use the References to access important values if needed for this question. For aluminum, Al, the heat of vaporization at its normal boiling point of 2467 °C is 284.1 kJ/mol. The entropy change when 1.85 moles of Al vapor condenses at 2467 °C, 1 atm is J/K. Submit Answer Retry Entire Group 9 more group attempts remaining Use the References to access important values if needed for this question....
Use the References to access important values if heededor A chemical reaction is run in which the surroundings are cooled by 300 J, and 272 J of work is done on the system. Calculate the change in the internal energy of the chemical system. AE = Submit Answer Retry Entire Group 4 more group attempts remaining
A gas is compressed and during this process the surroundings do 43.3 J of work on the gas. At the same time, the gas absorbs 281 J of heat from the surroundings. What is the change in the internal energy of the gas? Submit Answer 1 question attempt remaining
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