Question

a Explain why ethene ) hs h Volue fer C at 200K C0 b-why is the cqualien Valid For an ideal gas even iF Pis not constant in Ehe precess? which is greater in abond breati YeacHon H ar AU? If the Ap For the chemical mpends invelyed in areaction are Known at a given tempenature, how Can &pt be Calealated at another kempenafure?

Answer 1

1.Cv is proportional to atomiticity & linear ,non linear nature of compounds

atomicity of ethene is higher than co

2) Enthalpy  a property of a thermodynamic system, is equal to the system's internal energy plus the product of its pressure and volume.^[1][2] In a system enclosed so as to prevent mass transfer, for processes at constant pressure, the heat absorbed or released

${\displaystyle H=U+pV,}$

where

H} is enthalpy,

U} is the internal energy of the system,

p} is pressure V} is the volume of the system.

${\displaystyle dH=C_{p}\,dT+V(1-\alpha T)\,dp.}$

Here C_p is the heat capacity at constant pressure and α is the coefficient of (cubic) thermal expansion:

${\displaystyle \alpha ={\frac {1}{V}}\left({\frac {\partial V}{\partial T}}\right)_{p}.}$

With this expression one can, in principle, determine the enthalpy if C_p and V are known as functions of p and T.

Note that for an ideal gas, αT = 1,^{[note 2]} so that

${\displaystyle dH=C_{p}\,dT.}$ SO THE GIVEN EQUATION IS CORRECT

C) GENERALLY CHANGE IN ENTHALPY IS LARGER

D)USING KIRCHOFFS EQUATION