question_answer1) What will happen to the internal
energy if work is done by the system?
question_answer2) Change in internal energy is a
state function while work is not, why?
question_answer4) State the thermodynamic
conditions for the process to occur spontaneously?
question_answer7) When a piece of ice is placed on
your hand, you get a cold sensation. Why?
question_answer8) Why is standard heat of
formation of diamond not zero although it is an element?
question_answer9) Hess's law is a corollary of the
first law of thermodynamics. Comment.
question_answer13) An exothermic reaction may not
be always thermodynamically spontaneous. Justify.
question_answer15)
The entropy of steam is more than that
of water at its boiling point. Explain.
question_answer18) Can the absolute value of internal energy be determined?
Why or why not?
question_answer24) Under what condition \[\Delta H\] becomes equal to \[\Delta
U\]?
question_answer26) Why standard heat of formation of diamond is not zero though
it is an element?
question_answer38) Why endothermic reactions are favoured at high temperature?
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(i) Heat of formation of \[C{{H}_{4}}\] in terms of \[\Delta {{H}_{1}},\,\Delta {{H}_{2}}\] etc.
(ii) Heat of sublimation of \[{{C}_{graphite}}\] in terms of \[\Delta {{H}_{1}},\,\Delta {{H}_{2}}\] etc.
(iii) Heat of dissociation of \[{{H}_{2}}\] in terms of \[\Delta {{H}_{1}},\,\Delta {{H}_{2}}\] etc. 