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Thermodynamics Chemistry

05/03/22

Vapor pressure and mole fraction

An equimolar liquid mixture of water and ethanol is in equilibrium with its vapor. (i) Find the total vapor pressure(ii) Find the mole fraction of water in vapor. P(water)=24mmHgP(ethanol)=45mmHg

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Thermodynamics Chemistry

05/03/22

Find mass of oxygen

A mixture consists of nitrogen and oxygen. Increasing the Gibbs free energy of the nitrogen by 22 J results in a decrease of 4 J/mol in the chemical potential of the oxygen. How many grams of... more

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Thermodynamics Chemistry

05/03/22

Using the Clapeyron equation write an expression for Ta, its boiling point at a pressure Pa. The expression should be given where T is in terms of Pa, Tb, its heat of vaporization, and physical... more

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Thermodynamics Chemistry

04/27/22

If 25.5 g of MgCl₂ are dissolved 500.0 g of water at 20.0 °C in an insulated container, a temperature change is observed. The ∆H of solution of MgCl₂ is -160.0 kJ/mol. Assuming that the specific ...

If 25.5 g of MgCl₂ are dissolved 500.0 g of water at 20.0 °C in an insulated container, a temperature change is observed. The ∆H of solution of MgCl₂ is -160.0 kJ/mol. Assuming that the specific... more

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Thermodynamics Chemistry

04/25/22

A 28.5 g piece of gold is heated and then allowed to cool. What is the change in temperature (°C) if the gold releases 0.106 kJ of heat as it cools? The molar heat capacity of gold is 25.4 J/mol･°C.

A 28.5 g piece of gold is heated and then allowed to cool. What is the change in temperature (°C) if the gold releases 0.106 kJ of heat as it cools? The molar heat capacity of gold is 25.4 J/mol･°C.

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Thermodynamics Biology Ecology

03/29/22

Why must sustainable food webs be structured this way?

Sustainable food webs often look like triangles when considering the relative amount of organisms in each part of the food web. Specifically, sustainable food webs have relatively large numbers of... more

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Thermodynamics Physics

03/26/22

Full answer and explanation to question in description would be greatly appreciated.

A 100g brass block is heated from room temperature (24 C) to 80 C and placed in contact with an identical brass block at room temperature, in order to increase its temperature. Calculate the final... more

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Thermodynamics Mechanical Engineering

03/16/22

Propulsion question

A medium sized aircraft with two turbojet engines installed is cruising at an altitude of 10000m at a Mach number of 0.8. At this flight condition, each engine has a net specific work output of 250... more

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Thermodynamics

03/14/22

Calculate ΔH° for the reaction below: 4NO2(g) 4NO(g) + 2O2(g) ΔH° = ?

Consider the following thermochemical equation:2NO(g) + O2(g) 2NO2(g) ΔH° = -113.2 kJCalculate ΔH° for the reaction below:4NO2(g) 4NO(g) + 2O2(g) ΔH° = ?Answer key: +226.4 kJThis was a complete... more

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Thermodynamics Chemistry Biochemistry

02/21/22

Fill in the blank: It is ridiculous to report the speed of a molecule u, to be μ=6051.78±30 ms−1. The correct way to record this measured speed is μ=??±30

μ=_??_ ± 30Thank you so much in advance!

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Thermodynamics Mechanical Engineering Civil Engineering

02/08/22

thermodynamics questions please answer all 4 of them

1) A constant volume process occurs in a closed container that has a volume of 4 m 3. Heat is added to the container such that the absolute pressure increases 120 kPa to 207 kPa. What is the work... more

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Thermodynamics Chemistry Chem

01/27/22

Acetylene (C2H2) is used in welding torches because it has a high heat of combustion. When 1.00 g of acetylene burns completely in excess O2 gas at constant volume, it releases 48.2 kJ of energy.

Calculate the molar heat of combustion of acetylene (kJ/mol) and the energy kJ) released per mole of O2 consumed

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Thermodynamics Chemistry Chem

01/27/22

If a natural gas heater supplies 6.4 x 10^6 J of energy with an 75.2 % heat transfer efficiency, how many grams of methane must be burned? (He = -803 kJ/mol)

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Thermodynamics Chemistry

01/27/22

A sample of CO(g) whose mass is 7.31 g is heated from 25.0°C to 197°C at a constant pressure of 4.62 bar.

A sample of CO(g) whose mass is 7.31 g is heated from 25.0°C to 197°C at a constant pressure of 4.62 bar. Calculate w (in J) for this process if q = 1308.1 J.

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Thermodynamics Chemistry

01/26/22

A block of silicon weighing 24.9 g is heated to 64.7 °C in boiling methanol

A block of silicon weighing 24.9 g is heated to 64.7 °C in boiling methanol. It is then dropped into 28.2 g of methanol initially at 28.1 °C. Find the final temperature of silicon + methanol in °C.

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Thermodynamics Chemistry

01/24/22

A 79.0 kg person uses 248 kJ of energy to walk 1.00 km

A 79.0 kg person uses 248 kJ of energy to walk 1.00 km. This energy comes from “burning” glucose (Burning 1.00 g of glucose produces 15.7 kJ of heat.), but only about 30.0% of the heat of... more

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Thermodynamics Chemistry

01/23/22

In metric terms, a typical automobile averages 5.48 km/L of gasoline burned

In metric terms, a typical automobile averages 5.48 km/L of gasoline burned. Gasoline has a heat of combustion of 48 kJ/g and a density of 0.68 g/mL. How much energy is consumed in driving an... more

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Thermodynamics Chemistry

01/23/22

A gold coin whose mass is 7.06 g is heated to 137.6°C...

A gold coin whose mass is 7.06 g is heated to 137.6oC and then quickly dropped into an ice calorimeter. What mass of ice melts? (The amount of heat in an ice calorimeter is determined from the... more

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Thermodynamics Chemistry

12/26/21

What is Entropy

I am confused with what is degree of randomness and how it is related to entropy

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Thermodynamics Math Mechanical Engineering

12/09/21

Isentropic efficiency of a adiabatic compressor

(a) What is the isentropic efficiency of this compressor? Saturated water vapor at 0.3000 MPa enters an adiabatic compressor and exits as steam at 3.000MPa at 450.0 C(b) What is the mass flow rate... more

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Thermodynamics Chemistry Heat Transfer

12/07/21

Why in industries liquid CO2 is stored around the temperature -25°C to -15°C?

By the PV diagram of CO2, the liquid CO2 can be present from -56.4°C to 31.1°C and 5.1 atm to 73.8atm pressure.Why do almost all industries store the liquid CO2 around the temperature -25°C to... more

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Thermodynamics Physics Physical Science Physics C

11/24/21

Specific heat capacity of water

I’m doing an experiment in physics about the heat capacity of water and I have questions that I don’t understand- A little info->Task/Mission- Determine the specific heat capacity of the water. ... more

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Thermodynamics Chemistry Thermochemisty

11/15/21

Thermochemistry

38.5 g of ammonium nitrate was added to 100.0 mL of water. The initial temperature of the water was 25.0 °C. After dissolution, the water temperature was measured at 5.80 °C. What is the enthalpy... more

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Thermodynamics Chemistry

11/10/21

Question about Chemistry

What is the change in internal energy of a system if the surroundings absorb 145 J of heatfrom the system while doing 98 J of work on the system?

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Thermodynamics Science Chemistry

11/03/21

Thermochemistry. Answer, step by step please. (show work)

1N2 (g) + 3H2 (g) = 2NH3 (g) ∆H = -91.2 kJ a. Is this exothermic or endothermic? b. Rewrite the equation with the energy as either a reactant or a product. c. What quantity of heat is released... more

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Vapor pressure and mole fraction

Find mass of oxygen

Clapeyron equation

If 25.5 g of MgCl₂ are dissolved 500.0 g of water at 20.0 °C in an insulated container, a temperature change is observed. The ∆H of solution of MgCl₂ is -160.0 kJ/mol. Assuming that the specific ...

A 28.5 g piece of gold is heated and then allowed to cool. What is the change in temperature (°C) if the gold releases 0.106 kJ of heat as it cools? The molar heat capacity of gold is 25.4 J/mol･°C.

Why must sustainable food webs be structured this way?

Full answer and explanation to question in description would be greatly appreciated.

Propulsion question

Calculate ΔH° for the reaction below: 4NO2(g) 4NO(g) + 2O2(g) ΔH° = ?

Fill in the blank: It is ridiculous to report the speed of a molecule u, to be μ=6051.78±30 ms−1. The correct way to record this measured speed is μ=??±30

thermodynamics questions please answer all 4 of them

Acetylene (C2H2) is used in welding torches because it has a high heat of combustion. When 1.00 g of acetylene burns completely in excess O2 gas at constant volume, it releases 48.2 kJ of energy.

If a natural gas heater supplies 6.4 x 10^6 J of energy with an 75.2 % heat transfer efficiency, how many grams of methane must be burned? (He = -803 kJ/mol)

A sample of CO(g) whose mass is 7.31 g is heated from 25.0°C to 197°C at a constant pressure of 4.62 bar.

A block of silicon weighing 24.9 g is heated to 64.7 °C in boiling methanol

A 79.0 kg person uses 248 kJ of energy to walk 1.00 km

In metric terms, a typical automobile averages 5.48 km/L of gasoline burned

A gold coin whose mass is 7.06 g is heated to 137.6°C...

What is Entropy

Isentropic efficiency of a adiabatic compressor

Why in industries liquid CO2 is stored around the temperature -25°C to -15°C?

Specific heat capacity of water

Thermochemistry

Question about Chemistry

Thermochemistry. Answer, step by step please. (show work)

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