#### Gibbs free energy and chemical potential

Focus Question: Consider a sample of CaO(s) at 298K and 1 atm. Does the Gibbs energy of the sample increase, decrease of remain the same if the temperature is raised to 350K? Does the Gibbs energy of the original sample increase, decrease of remain the same if the pressure is increased to 2 atm? Im...

#### First and second law of thermodynamics

1. For the following processes, state whether the driving force is the first or second law of thermodynamics. The systems are in italics and we are only interested in whether the properties of the system have changed. Explain your choice in 1-2 sentences. a. Warming up exercises when muscles are ...

#### Calculation of ammonia thermodynamic properties

1. In the table below is the thermodynamic data for ammonia (http://en.wikipedia.org/wiki/Ammonia_%28data_page%29) use this data to solve the following problems for mole of ammonia (state any assumptions you made): a. What is the melting point at standard conditions for ammonia? Boling point is giv...

#### 1-st and 2-nd laws of Thermodynamics

1. Solve both of the following problems a. A sample of an ideal gas has the following initial conditions V=15L, T=250K and P=1atm. It is compressed isothermally until the change in entropy is -5J/K. What are the final conditions? b. Calculate the change in entropy when 50g of 80C water is poured i...

#### Energy Transfer in Living Organisms

-Define the laws of thermodynamics. Include an example to support your definition. -What is Gibbs free energy? What are consequences for a biochemical reaction when Gibbs free energy is negative? Explain the role of enzymes when Gibbs free energy is negative and when it is positive. -Adenosine ...

#### Thermodynamics of a Helium Gas Filled Balloon

A balloon is filled with helium gas at 20.0ºC at 1.0atm (1atm = 1.01x10^5 N/m^2).The volume of the balloon after filling is measured to be 8.50m^3. The helium is then heated at constant pressure until its temperature is 55.0ºC. What is the heat flow into the gas? (CP for an ideal gas is (5/2)R.)

#### Heat flow through a window

A glass window 0.60 cm thick measures 83 cm by 42 cm. How much heat flows through this window per minute if the inside and outside temperatures differ by 18°C? _______ kJ/min The conversions are confusing me.

#### Vibrations and Harmonic Oscillators

i) Show that the thermodynamic properties of an assembly of N three-dimensional harmonic oscillators are the same as those of an assembly of 3N of on-dimensional oscillators. ii) In the Einstein model, each atom in a solid acts as a three-dimensional simple harmonic oscillator. An atom in a cryst...

#### Thermodynamics: Mass Flow Rate of Steam

A boiler takes fuel oil of specific gravity 0.81 and calorific value of 27912KJ/KG form a tank 6.0M in diameter. At the time of the maximum firing, the level of fuel oil in the tank is lowered 51mm in one hour, and the absolute boiler pressure is 1620Kpa. What is the mass flow rate of steam from...

#### Heating a Gas

Heat required to raise 1 kg carbon dioxide from -100 degrees C to -50 degrees C. I arrived at an answer of 654,657 Joules. I used the following: CO2-solid spec heat = 815 J/kgC CO2-vapor spec heat = 2 J/kgC sublimation point of 5...

#### Conceptual physics for mass

Provide a formula and then solve so I can see how to do this type of problem. A block of iron is heated from 22 degrees celcius to 52 degrees celcius, absorbing 6,750j of thermal heat. What is the mass of the block? Solve for mass but need to see formula and how you did this so I can learn th...

#### Physics Problem Set

1. A loud speaker is placed between two observers who are 120m apart, along the line connecting them. If one observer records a sound level of 60.0dB and the other records a sound level of 90dB, how far is the speaker from each observer? a: 3.7, 116.3 b: 4.3, 115.7 c: 6.2, 113.8 d: 8.6, 111.4....

#### Heat Pump Problem

A heat pump is a heat engine run in reverse. In winter it pumps heat from the cold air outside into the warmer air inside the building, maintaining the building at a comfortable temperature... a. If the outside temperature in winter is ... See attached file for full problem description.

#### Air flow speed

The heating and airflow ducts to and from the room are circular 0.30m in diameter, the room is 3mx4.5x6m and the air flow needs to be changed every 12 minutes. Calculate the Air flow speed.