191 Answered Questions for the topic thermodynamics

Thermodynamics Science Chemistry

11/02/21

Thermochemistry. Answer, step by step please. (show work)
1) 2C (s) + 2H2 (g)  1C2H4 (g) ∆H = 52.3 kJ a. Is this exothermic or endothermic?b. Rewrite the equation with the energy as either a reactant or a product.c. What volume of Ethene gas can be... more
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Thermodynamics Biology Chemistry Physics

10/29/21

Honors High School Chemistry
What is the mass of CO2 (carbon dioxide) and H2O (water) formed from the reaction of 1 mole each of n-pentane, n-hexane, n-heptane, and n-octane with an excess of O2 (oxygen gas)? Assume 100%... more
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Thermodynamics

10/28/21

heat engines thermodynamics
What is the entropy change of a gas in J/K (to 2 decimal points) when one mole of a perfect gas reversibly expands from 0.36 m3 to 2.42 m3?
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10/20/21

Thermo Question Steady-Flow System
An air-conditioning system involves the mixing of cold air and warm outdoor air before the mixture is routed to the conditioned room in steady operation. Cold air enters the mixing chamber at 7°C... more
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Thermodynamics Physics

09/19/21

Determine how high the combustion of 1.000 mol of CO could lift a 1.00 kg mass near the surface of the earth
Carbon monoxide is used as the fuel for a Carnot engine with a high temperature of 450 o C and a cool temperature of 100 o C. Determine how high the combustion of 1.000 mol of CO could lift a 1.00... more
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Thermodynamics Math Science Chemistry

09/15/21

Thermodynamics Basic principles, concept and definitions
Using local g = 9.807 m/s^2, and that its variation is -0.003 ft/s^2 per 1000 ft ascent. Find the height in meters where the weight of a given man is reduced by 0.3%
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Thermodynamics Math Science Chemistry

09/15/21

Thermodynamics Basic principles, concept and definitions
A garden hose attached with a nozzle is used to fill a 10 gallon bucket. The inner dia of the hose is 2 cm and it reduces to 0.8 cm at the nozzle exit. If it takes 50 seconds to fill the water... more
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Thermodynamics Chemistry Organic Chemistry

08/29/21

What does the change of enthalpy per mole of oxygen in a combustion reaction say about the amount of energy that can be released?
For example, if -445.7 kJ is released per 1 mole of oxygen in the combustion of ethane, what does this say about the reaction?
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07/15/21

I am very lost on how to solve this: Grade 12 chemistry
In the following reaction, the initial rate of production of N2O gas is 0.51 mol/(L*s) What is the rate of loss of NO3NO(g) ---> N2O(g) + NO2(g)
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06/02/21

Chromatography and CO2 reduction

How can chromatography and CO2 reduction help combat climate change? I know that chromatography is a technique for the separation of a mixture but I don’t how it might help in combating the climate... more
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Thermodynamics Chemistry

05/12/21

Calculating Enthalpy, Entropy, and Molar Enthalpy in a calorimeter experiment? PLEASE HELP!
When 3g of Ammonium Chloride is added to 10ml of water in a calorimeter, the temperature over a five-minute period drops from 27.1 degrees celsius to 19.8 degrees celsius. The table of the results... more
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Thermodynamics Chemistry

05/10/21

Calculating Enthalpy in a Calorimeter Experiment- PLEASE HELP!
When 3g of Ammonium Chloride is added to 10ml of water in a calorimeter, the temperature over a five-minute period drops from 27.1 degrees celsius to 19.8 degrees celsius. The table of the results... more
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Thermodynamics Chemistry

04/28/21

Question about phase change calorimetry! Help
Hello, so we've recently conducted a calorimetry experiment wherein we had to mimic an isolated system by melting ice cubes in hot water.The questions are: Calculate the heat exchanged in the... more
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Thermodynamics Chemistry

04/14/21

The following cell has a potential of 0.10 V at 25oC. What is the pH of the solution in the cathode compartment?
Ni(s) | Ni2+(aq) (1.0 M) || H+ (? M) | H2(g) (1.0 atm) | Pt(s)  
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04/12/21

Thermodynamics- Combustion -Conservation of Energy
I was able to figure problem one, but I need help with problem 2. Thank you for the help!Problem #1: Ethane (C2H6) gas at mass flow rate of 1.5 kg/min is mixed with air (O2 + 3.76N2) at mass flow... more
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Thermodynamics Chemistry

04/09/21

I2(g) + Cl2(g) < ==== > 2 ICl(g) An equilibrium mixture of the above contains 0.0100 atm I2(g), 0.0100 atm Cl2(g), and 0.0900 atm ICl(g) at 298 K. Calculate the Delta G at standard condition.

This was a multiple choice question. I don't know what I was doing wrong. I tried using the formula: delta G= delta G° + RT ln(Q)I got delta G° = -30440 J/mol by using the Gf table 2(-5.52)-19.4+0... more
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Thermodynamics Science Chemistry Biochemistry

04/08/21

Predict the sign of ΔS for the following reactions. Then predict whether the reaction is spontaneous, non-spontaneous, or dependent on the magnitude of ΔH, ΔS and temperature.

a.) Na2CO3 (s) Na2O (s) + CO2 (g) (endothermic) b.) 2NF3 (l) N2 (g) + 3F2(g) (exothermic) c.) 2XeO3 (s) 2Xe (g) + 3O2(g) (exothermic)
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Thermodynamics Physics Physics B Physics C

04/07/21

Change in Droplet Temperature
A drop of rain falls from a height of 300 m in relation to the ground. The drop first falls uniformly accelerated with an acceleration of 6 m/s^2. At a height of 50 m from the ground the drop is... more
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Thermodynamics Chemistry Enthalpy Entropy

03/13/21

How can I use standard entropies and heats of formation to calculate ΔGƒ° at a certain temperature (°C)?
Use standard entropies and heats of formation to calculate ΔGƒ° at 25°C for the following compounds:a) ammonium nitrate (s)b) chloroform, CHCl3(l)c) potassium chloride (s)
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Thermodynamics Chemistry

03/11/21

Calculate ΔS° for each of the following reactions.
a) 2HNO3(l) + 3H2S(g) --> 4H2O(l) + 2NO(g) + 3S(s)b) PCl5(g) + 4H2O(l) --> 5Cl-(aq) + H2PO4-(aq) + 6H+(aq)c) MnO4-(aq) + 3Fe2+(aq) + 4H+(aq) --> 3Fe3+(aq) + MnO2(s) + 2H2O(l)
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Thermodynamics Chemistry Entropy

03/11/21

(Entropy, ΔS°) Predict the sign of ΔS for the following.
a) a lake freezingb) precipitating lead chloridec) a candle burningd) weeding a garden
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02/14/21

100 g of ice at 0 ºC is added to an insulated chamber containing 20 g of steam at 100 ºC. What is the final temperature of the 120 g of water
I began by saying the following: Qabsorbed by ice=Qreleased by steam ... more
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Thermodynamics Physical Chemistry

12/18/20

Help please ASAP!

A sample consisting of 2.0 mol CO2 occupies a fixed volume of 15.0 dm3at 300 K. When it is supplied with 2.35 kJ of energy as heat its temperature increases to 341 K. Assuming that CO2 is described... more
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Thermodynamics Science Chemistry

12/14/20

I'm very confused about this please help! (Hess Law)
Using the equations 2 C₆H₆ (l) + 15 O₂ (g) → 12 CO₂ (g) + 6 H₂O (g)∆H° = -6271 kJ/mol 2 H₂ (g) + O₂ (g) → 2 H₂O (g) ∆H° = -483.6 kJ/mol C (s) + O₂ (g) → CO₂ (g) ∆H° = -393.5 kJ/mol Determine the... more
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Thermodynamics Chemistry

12/14/20

I really need help with this fast!
Using the equations H₂ (g) + F₂ (g) → 2 HF (g) ∆H° = -79.2 kJ/mol C (s) + 2 F₂ (g) → CF₄ (g) ∆H° = 141.3 kJ/mol 2 C(s) + 2 H₂ (g) → C₂H₄ (g) ∆H° = -97.6 kJ/mol Determine the enthalpy (in kJ/mol)... more
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