Thermodynamics
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The term - TΔS_total at constant temperature and pressure is known as
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The term - TΔS_total at constant temperature and pressure is known as
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An ideal gas undergoes a thermodynamic process in which internal energy (U) of the gas depends on pressure (P) of the gas as U = aP4, where a is a positive constant. Assuming gas to be monoatomic, the molar heat capacity of the gas for given process will be
An ideal gas undergoes a thermodynamic process in which internal energy (U) of the gas depends on pressure (P) of the gas as U = aP4, where a is a positive constant. Assuming gas to be monoatomic, the molar heat capacity of the gas for given process will be
U = aP?
PV/ (γ-1) = aP?
P? ³V = a (γ - 1)
PV? ¹? ³ = constant
Comparing with PV? = constant
x = -?
C = R/ (γ-1) + R/ (1-x) = R/ (5/3 - 1) + R/ (1 +? ) = 3R/2 + 3R/4
C = 9R/4
Upvote 
A cup of coffee cools from 90°C to 80°C in t minutes, when the room temperature is 20°C.
The time taken by a similar cup of coffee to cool from 80°C to 60°C at a room temperature same at 20°C is:
A cup of coffee cools from 90°C to 80°C in t minutes, when the room temperature is 20°C.
The time taken by a similar cup of coffee to cool from 80°C to 60°C at a room temperature same at 20°C is:
According to Newton's law of cooling
(T? -T? )/t = K [ (T? +T? )/2 - T? ]
For 1? cup of coffee,
(90-80)/t = K [ (90+80)/2 - 20]
For 2? cup of coffee,
(80-60)/t' = K [ (80+60)/2 - 20]
Divide (1) by (2)
t'/t = 65/50 ⇒ t' = (13/5)t
Upvote Identify the product in the following reaction:
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Identify the product in the following reaction:
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Bromobenzene is formed in first step (Sandmeyer reaction), which further gives phenyl magnesium bromide. Phenyl magnesium bromide further gives benzene with water.
+Mg (Br)OH
Upvote The structures of beryllium chloride in solid state and vapour phase, are :
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The structures of beryllium chloride in solid state and vapour phase, are :
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BeCl? in solid state exist in a polymeric form & in a vapour state in exist in a dimeric form.
chain polymeric structure
Vapour state exist in a dimeric form
Upvote Which of the following p – V curve represents maximum work done?
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Which of the following p – V curve represents maximum work done?
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Maximum work is done in the case where area under the curve is maximum.
Upvote A Carnot engine has an efficiency of when its source is at a temperature . The temperature of the sink is:
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A Carnot engine has an efficiency of when its source is at a temperature . The temperature of the sink is:
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As increased by 3 times
So
- (c) Fundamental harmonic frequency open pipe
(say)
Fundamental harmonic frequency of closed pipe
(say)
Upvote An ideal gas in a cylinder is separated by a piston in such a way that the entropy of one part is S? and that of the other part is S?. Given that S? > S?. If the piston is removed then the total entropy of the system will be :
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An ideal gas in a cylinder is separated by a piston in such a way that the entropy of one part is S? and that of the other part is S?. Given that S? > S?. If the piston is removed then the total entropy of the system will be :
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Kindly go through the answers
S? × S?
Upvote For an adiabatic expansion of an ideal gas, the fractional change in its pressure is equal to ( where γ is the ratio of specific heats):
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For an adiabatic expansion of an ideal gas, the fractional change in its pressure is equal to ( where γ is the ratio of specific heats):
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PV? = C ⇒ V? (dP/dV) + P (γV^ (γ-1) = 0 ⇒ dP/dV = -γ (P/V) ⇒ dP/P = -γ (dV/V)
Upvote