Shweta Thakur posted an Question
September 24, 2020 • 01:36 am 30 points
  • IIT JAM
  • Chemistry (CY)

What is the use of specific heat here btw i got 2 kj by direct subtracting -393-(-395) 98 eats of these substances are 720 and 505

Lal 20. The heats of combustion of graphite and diamond at 298 K are -393 and -395 kJ/mole respectively. The specific heats of these substances are 720 and 505 J kg Krespectively. Calculate the heat of transformation of graphite into 28. A heat pu 15°C and from the diamond at 273 K. (2-0645 kJ mole 29. Given the 12 [Hint: AH= [-393 -(395) }+ (0-720-0-505) 1000 x (298-273) ]

1 Answer(s) Answer Now
  • 0 Likes
  • 1 Comments
  • 0 Shares
  • comment-profile-img>
    Priyanshu kumar Best Answer

    Here at different temperature it is asking for finding of heat of transformation. So it is used here,if it is asking only for same temperature given then you can proceed directly 👍

    eduncle-logo-app

    see the hint ..also and I am getting 2 answer right n

    eduncle-logo-app

    But ans is 2.0645 and you get only 2...

    eduncle-logo-app

    slightly difference occur here as only at diff temp it is asking

    eduncle-logo-app

    then plz expalin the answer

    eduncle-logo-app

    beacuse I have just subtracted the heat combustions

    eduncle-logo-app

    here Del H = m del Cp delT formula is used

    eduncle-logo-app

    For exact calculation you can use but for nearly you directly calculate

    eduncle-logo-app

    sir

    eduncle-logo-app

    ik Baar aap kr dena sir

    eduncle-logo-app

    when u get free

    eduncle-logo-app

    sir

    eduncle-logo-app

    okk wait

    eduncle-logo-app

    bs ise calculate krna tha

    eduncle-logo-app

    ok

    eduncle-logo-app

    this you got na or any doubt then please ask

whatsapp-btn

Do You Want Better RANK in Your Exam?

Start Your Preparations with Eduncle’s FREE Study Material

  • Updated Syllabus, Paper Pattern & Full Exam Details
  • Sample Theory of Most Important Topic
  • Model Test Paper with Detailed Solutions
  • Last 5 Years Question Papers & Answers