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महाराष्ट्र राज्य शिक्षण मंडळएचएससी विज्ञान (सामान्य) इयत्ता १२ वी

Answer the following in one or two sentences. State second law of thermodynamics in terms of entropy.

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प्रश्न

Answer the following in one or two sentences.

State second law of thermodynamics in terms of entropy.

टीपा लिहा
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उत्तर १

Statement: “The second law of thermodynamics states that total entropy of a system and its surroundings increases in a spontaneous process.”

For the process to be spontaneous,

`triangle "S"_"total" = triangle "S"_"sys" + triangle "S"_"surr"` > 0.

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उत्तर २

Second law of thermodynamics in terms of entropy:
The second law of thermodynamics states that, “The total entropy of the system and its surroundings (universe) increases in a spontaneous process”.

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  या प्रश्नात किंवा उत्तरात काही त्रुटी आहे का?
पाठ 4: Chemical Thermodynamics - Exercises [पृष्ठ ८७]

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बालभारती Chemistry [English] Standard 12 Maharashtra State Board
पाठ 4 Chemical Thermodynamics
Exercises | Q 2.6 | पृष्ठ ८७

संबंधित प्रश्‍न

Define entropy.


In which of the following, entropy of the system decreases?


Answer the following in one or two sentences.

State whether ΔS is positive, negative or zero for the reaction 2H(g)  →  H2(g). Explain.


Answer the following in one or two sentences.

If the enthalpy change of a reaction is ∆H how will you calculate the entropy of surroundings?


Answer the following in one or two sentences.

Comment on the spontaneity of reactions for which ∆H is positive and ∆S is negative.


Equilibrium constant for a reaction is 20. What is the value of ΔG° at 300 K? (R = 8 x 10-3 kJ)


For a process, entropy change of a system is expressed as ________.


For a reversible spontaneous change, ∆S is ____________.


In which of the following, ∆S is positive?


For the reaction:

\[\ce{2Cl_{(g)} -> Cl2_{(g)}}\]


Which of following is residual entropy of a substance?


Calculate the amount of heat liberated during formation of 2. 7 kg of water if heat of formation of water is - 284.5 kJ mol-1.


The equilibrium constant for a reaction is 10, value of ΔG° at 300 K is (R = 8 × 10-3 kJ)


For a reaction ΔH = - 30kJ and ΔS = - 45 JK-1, at what temperature reaction changes from spontaneous to non-spontaneous?


Relation between ΔH and ΔU for the reaction, \[\ce{2SO_{3(g)} -> 2SO_{2(g)} + O_{2(g)}}\] is _______.


A reaction is spontaneous at low temperatures but non-spontaneous at high temperatures. Which of the following is true for the reaction?


The criterion for a spontaneous process is ______.


In which of the following reaction the value of Kp will be equal to Kc?


Write the correct condition for spontaneity in terms of Gibbs energy.


Identify whether the following pair have a larger entropy or not. If yes then Why?

O2{g) at 1 atm or O2(g) at 10 atm both at the same temperature.


Identify whether the following pair have a larger entropy or not. If yes then Why?

C2H5OH(l) or C2H5OH(g)


Calculate ΔG for ΔH = − 110 kJ, ΔS = + 40 J K−1 at 400 K.


ΔH for the reaction is − 110 kJ, and ΔS is + 40 JK−1 at 400 K. The free energy change for the reaction is ______.


For a certain reaction ΔH0 is −224 kJ and ΔS0 is −153 J K−1. At what temperature the change over from spontaneous to non-spontaneous will occur?


Calculate ΔG0 for the reaction

\[\ce{CH_{4(g)} + H_{2(g)}-> C2H_{6(g)}}\]

State whether the reaction is spontaneous or not. (Given: KP = 3.358 × 1017, T = 25° C, R = 8.314 × 10−3 kJK−1 moI−1)


Define second law of thermodynamics.


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