Give relationship between entropy change and heat absorbed/evolved in a reversible reaction at temperature T.
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Name a metal When calcium metal is added to water the gas evolved does not catch fire but the same gas evolved
In both cases, the gas evolved is H2. When calcium reacts with water the heat evolved is not sufficient for hydrogen to catch fire. On the other hand, sodium metal...
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A heat engine absorbs heat Q1 at temperature T1 and heat Q2 at temperature T2.
(d) : It does not violate first law of thermodynamics but violates second law of thermodynamics.
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The correct relationship between free energy change in a reaction and the corresponding equilibrium constant Kc is
(d) : ΔG = ΔG° + 2.303 RTlogKc At equilibrium, ΔG = 0 ΔG° = –2.303 RTlogKc
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In a process, 802 J of heat is absorbed by a system and 294 J of work is done by the system. What is the change in internal energy for the process?
ΔU = q + w ΔU = 802 + (-294) =508J
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Express the change in internal energy of a system when:- No heat is absorbed by the system from the surroundings, but work
Δ U = w , wall is adiabatic
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Under what condition, the heat evolved/absorbed in a reaction is equal to its free energy change?
In ∆G = ∆H – T. ∆S, when reaction is carried out at 0 K or ∆S = 0, then ∆G = ∆H.
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What is meant by entropy driven reaction? How can the reaction with positive change of enthalpy and entropy be made entropy driven?
The free energy change of a reaction is given by ΔG = ΔH – TΔS For a reaction to be spontaneous, ΔG should be –ve. If both ΔH and ΔS are positive...
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Two ideal gases under same pressure and temperature are allowed to mix in an isolated system. What will be the sign of entropy change?
Entropy change (∆S) is positive. It is because disorder or degree of freedom increases on mixing.
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Is physical change is always a reversible change? If yes read my another doubt below.
Physical change is not always reversible. The cutting piece has same properties as wood before cutting. physical change means changes are reversible and no new substances must be formed .
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In the presence of a catalyst, the heat evolved or absorbed during the reaction ___________.
(iii) remains unchanged.
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