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Results for Thermodynamics

First law of Thermodynamics

First law of Thermodynamics states that " Amount of heat changed in system is equal to sum of change in internal energy and workdone of a system". First law if Thermodynamics is also known as princ...

Chemical Thermodynamics

Introduction There are so many natural phenomena which occur along a particular direction. To answer the feasibility of a process along a particular direction, second law of thermodynamics is requi...

Second Law of Thermodynamics

 A Qualitative approachThis approach is not an equational approach but rather a statement of impossibility. This includes 'Kelvin-Planck statement' and 'Clausius statement'.1) Kelvin-Planck Stateme...

1. Which of the following is correct expression of the first law of thermodynamics?a) q=  ∆ H - Wb)  ∆ H=q+Wc) ∆ U= q+ Wd) ∆ U= ∆ H +P ∆ V 2.The first law of thermodynamics fails to decide________...

1. Which of the following is correct expression of the first law of thermodynamics?

a) q=H - W

b)H=q+W

In equations for ideal gas and thermodynamics , what is the difference between 'R' and 'r' . 

Value of R is a constant for all gases while value of r is a variable for all gases but a constant for a specific gas.

Explanation:

Starting with the Ideal gas equation,PV = nRT.

R in the above equation stands for Universal Gas Constant whose value is a constant 8.314 J/mol-K for all gases.

However, when we put n = M/m where M represents total mass of gas present and m the molar mass of the gas.

The value of R/m = r or r = R/m is defined as the specific gas constant for a gas. Clearly, r is a...

7 .Which of the following is the largest unit of energy?electron voltjoulecalorieerg8. A perfect black body has a unique characteristic feature asa good absorber onlya good radiatora good absorber ...

7: Calorie is the largest unit of energy, among the given.


8: A perfect black body has a unique characteristic feature as a good absorber and a good radiator.


9: A thermodynamic process where no heat is exchanged with the surroundings is adiabatic.


10: Nernst formulated the Third law of thermodynamics.


11: The irreversibility of a process occurs due to either a) lack of equilibrium during the process or b) involvement of dissipative effects or both.


12: Efficiency of heat engine cycle is the ratio...

Why does a refrigerator consume more power in summer than in winter to cool the same quantity of food by the same degree?

Answer: Heat pumps are designed to move thermal energy opposite to the direction of spontaneous heat flow by absorbing heat from a cold space and releasing it to a warmer one. Due to surrounding temperature a refrigerator consume more power in summer than in winter to cool the same quantity of food by same degree.

Energetics of Chemical reaction

Thermodynamic termsIn order to study the law of thermodynamics it is essential to understand certain terms used in thermodynamics. These terms have definite meaning. So, the most commonly used term...

A Carnot engine whose high-temperature reservoir is at 620 K takes in 550 J of heat at this temperature in each cycle and gives up 335 J to the low-temperature reservoir. (a) How much mechanical wo...

A Carnot engine whose high-temperature reservoir is at 620 K takes in 550 J of heat at this temperature in each cycle and gives up 335 J to the low-temperature reservoir. (a) How much mechanical work does the engine perform during each cycle? (b) What is

Solution:

Given,

Temperature of high-temperature reservoir (T1) = 620 K

Energy taken in each cycle (Q1) = 550 J

Energy given to low-temperature reservoir (Q2) = 335J

Now,

Mechanical work done in each cycle = Q1 - Q2

= 550 J - 335 J

= 215 J

Let the...

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