203 Answered Questions for the topic thermodynamics

Thermodynamics Physics Heat Efficiency

05/25/16

Heat needed? Energy needed?
a. Calculate the amount of heat needed to warm 24.6 kg of water from a room temperature of 20.0°C to 60.0°C for use in a dishwasher.b. If the water heater has an efficiency of 61%, how much energy... more
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Thermodynamics Physics

05/25/16

Latent heat of vaporization?
How much more heat is needed to boil 5.0 kg of water than is needed to melt it? The latent heat of vaporization for water is 2260 kJ/kg, and the latent heat of fusion is 333 kJ/kg. 
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Thermodynamics Physics Temperature

05/24/16

Final temperature?
If 0.20 kg of iron at 100°C is added to 1.00 kg of water at 20.0°C, what is the final temperature of the system?   Please explain
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Thermodynamics Physics

03/27/16

8 moles of gas is at 22 degrees C and has a volume of 2.0 m^3. If it goes through an isobaric expansion to twice its volume.
What is the change in internal energy, how much work is done by the gas, and how much heat flowed into or out of the gas.
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Thermodynamics

02/16/16

if a water/ice mixture is 0 degrees can the glass container be 0 degrees as well
if a water/ice mixture is 0 degrees can the glass container be 0 degrees as well
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Thermodynamics

02/01/16

Heat Transfer Problem
A hollow spherical iron container whose outer diameter is 95 cm and thickness is 4 mm is filled with iced water at 0ºC. If the outer surface temperature is 1ºC, determine the approximate rate of... more
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Thermodynamics

01/22/16

Between temperature and pressure of the system ,which is easy to fix and why?
if you were to fix temperature and pressure , which one will you choose and what is the  reason for your choice?
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Thermodynamics

01/22/16

why is it necessary to have a refrigerant of high critical pressure
i just wanna know the effect of critical pressure on the properties of refrigerant
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Thermodynamics Math Chemistry Physics

07/10/15

Physics: Thermodynamics (ice)
If a 0.06247 kg ice cube initially at 0.00 C is allowed to melt in a Styrofoam cup holding 0.497 kg of water at 10.0 C , what is the total entropy change for this process?
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Thermodynamics Math Science Chemistry

07/10/15

Physics: volume expansion, temperature (thermodynamics?)
Rivets can be cooled before they are put in place, thus when they reach equilibrium temperaturethey are more firmly fixed in place.   If the volume expansion of iron is 35.0 X 10-6 K-1 what... more
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Thermodynamics Math Science Chemistry

07/09/15

Phyysics: Coefficient of Performance
Consider a common refrigerator in a standard home, where the temperatures are 22.0 C in the home and the refrigerator is kept slightly above freezing. If a 0.750 kg ice cube initially at 0.00 C... more
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Thermodynamics Math Science Chemistry

07/09/15

Physics: Entropy Change
If a 0.06247 kg ice cube initially at 0.00 C is allowed to melt in a Styrofoam cup holding 0.497 kg of water at 10.0 C , what is the total entropy change for this process?
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Thermodynamics Math Science Chemistry

07/09/15

Physics: Calorimetry
Calorimetrya. How much heat needs to be taken from 0.5 kg of ethyl alcohol as a gas at its boiling point of 78.0 C to a solid at its freezing point -114 C if the latent heat of vaporization is... more
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Thermodynamics Math Chemistry Physics

07/09/15

Physics: what difference of temperature is needed to have 7.00 % difference of volume? (Thermodynamics)
Rivets can be cooled before they are put in place, thus when they reach equilibrium temperature they are more firmly fixed in place. If the volume expansion of iron is 35.0 X 10-6 K-1 what... more
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Thermodynamics Chemistry

07/09/15

How to find ?G°rxn when given only some of the ?G°f amounts?
I am not sure how to calculate ?G°rxn if I am not given all of the values for ?G°f. Can someone explain? I thought you     The question I am trying to answer --   Calculate the ?G°rxn using... more
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Thermodynamics Chemistry

07/08/15

Question on heat of reaction...Can someone show me how to do this?
A 35.6 g sample of ethanol (C2H5OH) is burned in a bomb calorimeter according to the following reaction. If the temperature rose from 35.0 to 76.0°C and the heat capacity of the calorimeter is 23.3... more
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Thermodynamics Math Chemistry Physics

07/08/15

Physics: Kinetic Theory
Kinetic theorya. What is the average kinetic energy of a monatomic gas at a temperature of 354 K?b. If this is Ne gas (neon has 20 nucleons) what is the root-mean-squared speed?c. What temperature... more
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Thermodynamics Math Physics Multiple Choice

07/06/15

Physics: Conceptual question (Multiple Choice)
If one wanted to help insulate their house, by replacing their windows made of the same material, would it be better to have, smaller windows (say let A = ½ original) or thicker glass (say twice... more
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Thermodynamics Physics Temperature Celsius

07/06/15

Physics: temperature
Using the correct relationship between temperature in Celsius and Fahrenheit, what one temperature has the Fahrenheit value equal the Celsius value?
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Thermodynamics Math Physics Pressure

07/06/15

Physics: What is the pressure?
If a tank has 2.50 g of N2 (nitrogen atom has 14 nucleons) and a volume of 1950 cm3 and it is held at 142 0 C, what is the pressure?
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Thermodynamics Math Physics Energy

07/06/15

Physics: Change in internal Energy
2.50 moles of an ideal monatomic gas are compressed from 315,000 Pa to 175,000 Pa at 0.0300 m3. What is the change in internal energy in this isochoric process?
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Thermodynamics

07/06/15

Thermodynamic Process
A 3.1-mole sample of an ideal gas is gently heated at constant temperature 290 K. The gas expands to 1.5 times its initial volume as its pressure decreases. What is the change in the internal... more
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Thermodynamics Chemistry Physics Heat

07/03/15

Wha is the final temperature of this mixture?
I'm reviewing some practice thermodynamics questions for my upcoming physics exam but I can't figure out how to set these up properly.   1. If you mix two parts hot 80° C water with one part 10°... more
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Thermodynamics

06/17/15

thermodynamics
How do you find the specific volume with just temperature and pressure given?
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Thermodynamics Physics

12/01/14

What is the Final Pressure?
Two containers contain the same gas at different temps and pressures as indicated below   Large Container:  temp:200K        Pressure:2X10^5         Volume: 1L   Small Container:  temp: 600K  ... more
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