191 Answered Questions for the topic thermodynamics

Thermodynamics Chemistry

11/20/20

chemistry/calorimetry (please help if you can)

A generic solid, X, has a molar mass of  69.6 g/mol. In a constant‑pressure calorimeter, 18.8 g of X is dissolved in 401 g of water at 23.00 °C.X(s) → X (aq) The temperature of the resulting... more
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Thermodynamics Chemistry Chem

11/20/20

thermochemistry problem (please help if u can!)
When 0.467 g of sodium metal is added to an excess of hydrochloric acid, 4950 J of heat are produced. What is the enthalpy of the reaction as written?2Na (s) + 2 HCL (aq) → 2NaCL (aq) + H2 (g)
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Thermodynamics Science Chemistry

11/20/20

calorimetry / thermodynamics problem

Potassium nitrate, KNO3, has a molar mass of 101.1 g/mol. In a constant-pressure calorimeter,  26.5g of KNO3 is dissolved in 243 g of water at 23.00ºC.KNO3 (s) → K+ (aq) + NO3- (aq)The temperature... more
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Thermodynamics Chemistry

11/20/20

calorimetry / thermodynamics problem

1 a. Assume that it is possible to heat water with perfect insulation (all the heat from combustion of ethanol is transferred to water).How much energy (in joules) is needed to heat 200.0 g of... more
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Thermodynamics Chemistry

11/20/20

Calorimetry/Thermodynamics problem. Please help if you can!
If you have 0.266 m3 of water at 25°C in an insulated container and add 0.112 m3 of water at 95°C, what is the final temperature Tf of the mixture? Use 1000 kg/m3 as the density of water at... more
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Thermodynamics Chemistry

10/19/20

Thermodynamic Question in Description

Question: A coffee cup calorimeter contains water at an initial temperature of 20 °C and is calculated to have a calorimeter constant (heat capacity) of 75 J/°C. A 28 g piece of an unknown metal is... more
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Thermodynamics Chemistry Gas Laws

10/19/20

If 33.6 g of NO and 26.9 g of O2 react together, what is the mass in grams of NO2 that can be formed via the reaction below?
2 NO (g) + O (g) → 2 NO (g) Second Question: What volume of NO2 could be isolated at 945 mbar and 28 °C?
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Thermodynamics Chemistry

10/19/20

Question about thermodynamics, it's too long to add here so its in the description.

Question: At 100 °C, 1.00 gram of liquid water has a volume of 1.043 mL. What volume will 1.00 gram of water vapor occupy at 100 °C at a pressure of 1.00 bar? What is the percent volume change in... more
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Thermodynamics Chemistry

10/12/20

Mean bond enthalpies: C=C 612kJ/mol, C-C 348 kJ/mol, C-HkJ/mol, H-H 436kJ/mol, C(s) —> C(g) 715kJ/mol

Mean bond enthalpies: C=C 612kJ/mol, C-C 348 kJ/mol, C-HkJ/mol, H-H 436kJ/mol, C(s) —> C(g) 715kJ/mol1 - Calculate the enthalpy change for the dimerisation of ethene to give cyclobutane2 C2H4(g)... more
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Thermodynamics Chemistry

10/11/20

The question is in the description.
The standard enthalpy of formation of H2O (l) is -286 kJ/mol and the standard enthalpy of combustion of ethane is -1560 kJ/mol. Given that the enthalpy change when one mole of ethene is redcued by... more
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Thermodynamics Chemistry

10/11/20

A calormeter has a mass of 200g and a specific heat capacity of 0.420 J g-¹. Into it are put 50.0 cm³ of 1.25 mol dm-³ hydrochloric acid and 50.0cm³ of 1.25 mol dm-³ potassium hydroxide solution at...
A calormeter has a mass of 200g and a specific heat capacity of 0.420 J g-¹. Into it are put 50.0 cm³ of 1.25 mol dm-³ hydrochloric acid and 50.0cm³ of 1.25 mol dm-³ potassium hydroxide solution at... more
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Thermodynamics Chemistry

10/11/20

The standard enthalpy of formation of H2O (l) is -286 kJ/mol and the standard enthalpy of combustion of ethane is -1560 kJ/mol. Given that the enthalpy change when one mole of...
The standard enthalpy of formation of H2O (l) is -286 kJ/mol and the standard enthalpy of combustion of ethane is -1560 kJ/mol. Given that the enthalpy change when one mole of ethene is redcued by... more
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Thermodynamics Mechanical Engineering

10/08/20

Final year project
hi I'm just starting my final year and have to complete a final year project. I'm trying to think of some ideas at the moment I have one or two to do with solar power but I am struggling to think... more
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Thermodynamics Physics

10/03/20

Thermodynamics Question
A reservoir contains 2.83 cu. m of carbon monoxide at 6895 kPa and 23.6 degrees celsius. An evacuated tank is filled from the reservoir to a pressure of 3497 kPa and a temperature of 12.4 degrees... more
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Thermodynamics Chemistry

09/25/20

Hess' Law chemistry
Given the following equationsH2(g) + 1/2 O2(g)  H2O(l)      ΔH = -285.8 kJN2O5(g) + H2O(l)  2 HNO3(l)      ΔH = -76.6 kJ1/2 N2(g) + 3/2 O2(g) + 1/2 H2(g)  HNO3(l)      ΔH = -174.1 kJCalculate... more
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Thermodynamics

09/22/20

Thermodynamics conversion
Convert 35 pints to cavan
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Thermodynamics Science Chemistry

09/16/20

How many joules of heat are needed to raise the temperature of 10.0 g of aluminum from 22°C to 55°C, if the specific heat of aluminum is 0.90 J/g°C?
How many joules of heat are needed to raise the temperature of 10.0 g of aluminum from 22°C to 55°C, if the specific heat of aluminum is 0.90 J/g°C?
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Thermodynamics Physics

09/11/20

Charge cost question
Suppose you get a new Samsung Galaxy S20 to take advantage of the new 5G network. Unfortunately, when you receive it, the 4000mAh battery is “dead”. Assume that the overall charging efficiency is... more
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Thermodynamics Physics

09/11/20

Wind Turbine Question
Suppose you own land which is on a mountain. You notice that at the top elevation of your property there is light and steady wind. You measure the wind with anemometer over the course of weeks and... more
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07/04/20

Thermochemistry Problem
When 125 mL of 0.220 M NaCl(aq) and 125 mL of 0.220 M AgNO3(aq), both at 21.6°C, are mixed in a coffee cup calorimeter, the temperature of the mixture increases to 24.3°C as solid AgCl... more
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Thermodynamics Microbiology Cello

06/14/20

Does living cells defy the 2​ law of thermodynamics?
Synthesis of protein molecules from the amino acids reduces randomness inside the cells. Does living cells defy the 2​ law of thermodynamics?
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Thermodynamics Chemistry Ap Chemistry

05/13/20

Thermochemistry practice problem
A 5.00-g sample of aluminum pellets (specific heat capacity "0.89 J/'C ! g) and a 10.00-g sample of iron pellets (specific heatcapacity " 0.45 J/'C ! g) are heated to 100.0'C. The mixtureof hot... more
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Thermodynamics Chemistry

05/08/20

Specific Heat and Calorimetry questions

Need some help with these questions for online schooling, and don't know what formula to use or how to do the questions in general. Any assistance is appreciated, thanks in advance.1.      A... more
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05/08/20

Hi, I need help on part e. I don't understand how to do it
Determine the following of the complete combustion of pentane (C5H12):a) What is the balanced chemical equation?b) What is the air-fuel ratio for the equation in part a?c) What is the balanced... more
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Thermodynamics Chemistry

04/08/20

A calorimeter has a heat capacity of 1265 J/oC. A reaction causes the temperature of the calorimeter to change from 22.34oC to 25.12oC. How many joules of heat were released in this process?
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