203 Answered Questions for the topic thermodynamics

Thermodynamics Physics

04/16/19

Thermodynamics physics homework help
An engine using 1 mol of an ideal gas ini- tially at 21.7 L and 326 K performs a cycle consisting of four steps:1) an isothermal expansion at 326 K from 21.7 L to 42.1 L;2) cooling at constant... more
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Thermodynamics Physics

04/16/19

Physics homework help on thermodynamics

Part 1) Two moles of helium gas initially at 148 K and 0.47 atm are compressed isothermally to 1.27 atm.Find the final volume of the gas. Assume that helium behaves as an ideal gas. The universal... more
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Thermodynamics Chemistry

04/11/19

Hess's law question?
The combustion of ethane can be expressed through the equation below: C2H6(g) + 7/2O2(g) ---> 2CO2(g) + 3H2O(g) Using Hess’ law, prove that the formation reactions of ethane, carbon dioxide and... more
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Thermodynamics Organic Chemistry

04/10/19

Migratory aptitude in Baeyer-Villiger reaction?
In short, I do not understand how or why the migratory aptitude is as listed in every textbook I've read. Firstly, they talk about a positive charge being built up that is stabilised by the... more
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Thermodynamics Chemistry

04/06/19

Thermodynamics Chemistry Combined Metals
A sheet of gold weighing 10.0 grams and at a temperature of 18.0 °C is placed flat on a sheet of iron weighing 30.0 grams at a temperature of 55.6 °C. What is the final temperature of the combined... more
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Thermodynamics Chemistry

04/01/19

a piston contracts
a piston contracts when it loses 51.1 J of heat. its working against a pressure of .549 atm. initial volume is 70.1. what is the final volume if the change in internal energy is 988J?
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Thermodynamics Chemistry

03/14/19

energy of combustion of biodiesel?
Calculate the energy of combustion per gram of Bio Diesel (kJ/g) if 29.0 mL of water is placed in the test tube and the temperature changes from 22.9 ºC to 41.5 ºC. The initial mass of the spirit... more
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Thermodynamics Chemistry

03/14/19

Calculate energy of combustion of methanol?
Calculate the energy of combustion per gram of Methanol (kJ/g) if 29.7 mL of water is placed in the test tube and the temperature changes from 22.9 °C to 51.1°C. The initial mass of the spirit... more
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Thermodynamics Chemistry

03/14/19

Question asking for energy of combustion?
Calculate the energy of combustion per gram of Olive Oil (kJ/g) if 30.7 mL of water is placed in the test tube and the temperature changes from 22.9 ºC to 44.6 ºC. The initial mass of the spirit... more
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Thermodynamics Astronomy Energy Sun

03/13/19

Do photons lose energy while travelling through space? Or why are planets closer to the sun warmer?
My train of thought was the following:The Earth orbiting the Sun is at times 5 million kilometers closer to it than others, but this is almost irrelevant to the seasons.Instead, the temperature... more
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Thermodynamics Chemistry

03/06/19

looking for minimum mass of methane?
Using a molar heat of combustion of –890 kJ/mol, The minimum mass of methane that must be burned to warm 5.64 kg of water from 21.5°C to 77.4°C, assuming no heat losses to the environment... more
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Thermodynamics Chemistry

03/05/19

finding the mass of hexane required?
Using a molar heat of combustion of hexane (C6H14) –4163 kJ/mol, the mass of hexane required to increase the temperature of 1.76 L of water from 21.0°C to 70.0°C is a.bc? g.  Put your answer... more
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Thermodynamics

02/23/19

thermodynamics gas laws
1dm^3 of air at 20oC is heated at a constant pressure of 300 kPA until the volume is doubled calculate:-final temperature -the mass
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Thermodynamics Chemistry

01/29/19

Chemistry and Compression of Gas
A gas is compressed 3 L while a constant external pressure of 1.2 atm is applied. What would the total change in internal energy be if 30.2 J of heat is released from the system after the compression? more
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Thermodynamics Chemistry

01/29/19

Change in Initial Energy
Calculate the mass of ice (c= 2.11 J/gC) required to melt (initial temperature 0 Celsius) in a 500 gram sample of iced team (assume c= 4.184 J/g C since it is mostly water) to lower the temperature... more
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Thermodynamics Chemistry Hess's Law

01/24/19

What is the molar enthalpy of formation for ammonia?
Hi I'm having issues relating hess's law to this question:The given chemical equation represent the combustion of ammonia and the combustion of hydrogen 1. 4NH3+3O2-->6H2O + 2N2. ( deltaH1 =... more
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Thermodynamics Chemistry

01/15/19

Can someone help me with this question please?

CH4(g) + 2 O2(g) --> CO2(g) + 2 H2O(g) The value of ΔH° (heat of formation) is –802.4 kJ/mol. Can you explain quantitatively the origin of the difference between this value and -890.0 kJ/mol... more
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Thermodynamics

01/07/19

Consider a mixture of air and gasoline vapor in a cylinder with a piston.

The original volume is 50. cm3. If the combustion of this mixture releases 1077. J of energy, to what volume will the gases expand against a constant pressure of 655. torr if all the energy of... more
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Thermodynamics

12/19/18

If you have 20kg of water at 100°C, how much ice (in kilograms) would you have to add to that water in order to bring the temperature down to 30°C?
I tried using the equation Q=mc∆T, but I keep on running into the roadblock where I can't find ∆T of the ice (the problem doesn't state the initial temperature of the ice). Any help would be... more
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Thermodynamics

11/20/18

what is thermodynamics?
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Thermodynamics Chemistry

10/27/18

work question please help!
26 grams of N2 is placed in clyinder at 25 degrees celisus and the piston is adjusted so that the gas occupies a volume of 37.6 L. A pressure of 1.8 atm is now applied to the piston and olume... more
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Thermodynamics Chemistry Organic Chemistry

10/27/18

thermochemistry

Determine heat of formation of CCl4g, at 298K, CH4 + Cl2 --> CCl4 + 4HCl reaction's, is -397.3kJCH4= -78.4 kjHCl= -92.3Cl2 = 0I tried to do the sum of the products - reactents = -397.3 but my... more
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Thermodynamics Chemistry Physics Entropy

08/29/18

When does the entropy usually increase?
Some of the answers are below, maybe you can help by answering which one's correct? A. Molecule broken into two or more. B. Reaction results in increasing in No. Of gas moles. C. solid changes... more
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Thermodynamics Chemistry Δh

07/27/18

Calculate ΔH for the overall reaction in units of joules
A styrofoam cup calorimeter is used to determine ΔH for the acid-base reaction: CH3COOH (aq) + NaOH (aq) ⇔ NaCH3COO (aq) + H2O (l)   when 25.00mL of 0.500M NaOH at 23.00°C is added to 25.00mL of... more
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07/26/18

what is a system in chemistry
 i would like to know how a chemistry student can define a system  
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