Shweta Thakur posted an Question
July 09, 2020 • 21:11 pm 30 points
  • IIT JAM
  • Chemistry (CY)

Why here heat absorbed is reversible ..why not irrereversivle.. ows that enropy claungo and t for a revers t the y imally slowly

ows that enropy Claungo and T for a reversible reaction as a process is defined as the amount of heat (q) absorbed isothermalh ure. AS rey T the y imally slowly) divided by the absolute tenmperature (T) at which the

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  • Suman Kumar best-answer

    This is the basic way of evaluating ΔSΔS for constant-temperature processes such as phase changes, or the isothermal expansion of a gas. For processes in which the temperature is not constant such as heating or cooling of a substance, the equation must be integrated over the required temperature range.

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    Qirr can't be integrated.

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    This Qrev is heat exchange for the system which is reversible in nature.

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    https://youtu.be/JA_JK3f8BGo

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    From 9 min onwards

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    ok mam

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    mam but I. reversible entropy is almost constant isn't it

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    Absolutely Yes

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    then why we take this

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    reversible case

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    System+surrounding is constant.

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    For system we need to calculate entropy.

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    ok mam thanks

  • comment-profile-img>
    Priyanshu kumar

    https://drive.google.com/file/d/1aK8I4X6ZIKEiUyYr2wt20EmkI2hhK1tg/view?usp=drivesdk for 2nd part

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    Priyanshu kumar

    https://drive.google.com/file/d/1DynOq54HOUENYdRIy_qGjJ6BTJbmDppR/view?usp=drivesdk shweta check it ms chouhan solution manual first part

  • comment-profile-img>
    Dinesh khalmaniya 1

    actually this is the formula of entropy change in reversible process. and in this process heat absorbed

  • comment-profile-img>
    Lingareddy 1

    if it is irreversible process we can written q irr

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    Lingareddy 1

    they mentioned it is reversible reaction

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    why it's reversible everytine

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    just we are imaging it is reversible that means it is ideal system

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    entropy is defined by recalling our discussion of the Carnot engine. We noted that for a Carnot cycle, and hence for any reversible processes,

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    The reason is that the entropy S of a system, like internal energy U, depends only on the state of the system and not how it reached that condition.

  • comment-profile-img>
    Priyanshu kumar Best Answer

    https://chemistry.stackexchange.com/questions/54479/why-does-more-heat-transfer-take-place-in-a-reversible-process-than-in-a-irrever read this shweta

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    I didn't get this

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    here process is mentioning reversible shweta

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    why not irrereversivle

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    see...you can mentioned both the system

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    for reversible and irreversible

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    ok sir

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    sir is there any solution book for ms Chauhan organic book

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    wait let me check it

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    shweta have you got this or any doubt then clear it

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    sir I think in reversible heat the entropy change is almost constant

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    yes and in irreversible the some heat is lost

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    so

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    reversible kyun hai JB entropy hi constant rhegi

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    shweta in irreversible process heat is transfer in pause and continue process so some heat is lost...but in reversible process it doesn't happen

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    this I got

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    please mark the ans too😊

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    ok sir 👍 got it

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