182 Answered Questions for the topic thermodynamics

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
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
Thermodynamics Chemistry

05/03/22

Clapeyron equation

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
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
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.
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
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
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
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.
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.
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
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
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
Thermodynamics Chemistry

12/26/21

What is Entropy

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

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
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
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?
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
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
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
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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