$A + B \rightleftharpoons C+D$
$27^{\circ}\,C$ પર પ્રમાણિત મુક્ત ઊર્જા ફેરફાર $\left(\Delta_{ r } G ^0\right)$ $(-)$ $............kJ mol ^{-1}$ છે. (નજીકની પૂર્ણાંક)
(આપેલ : $R =8.3\,Jk ^{-1}\, mol ^{-1}$ અને In $10=2.3$ )
\(\text { and } K _{ eq }=\frac{ K _{ f }}{ K _{ b }}\)
\(\therefore K _{ eq }=\frac{10^3}{10^2}=10\)
\(\therefore \Delta G =- RT \ln 10\)
\(\Rightarrow-(8.3 \times 300 \times 2.3)=-5.7\,kJ\,mole ^{-1} \approx 6\,kJ\)
\(\text { mole }{ }^{-1}(\text { nearest integer) }\)
\(\text { Ans }=6\)
(Given ${\Delta _{fus}}H = 6\, kJ\, mol^{-1}$ at $0\,^oC$,
$C_p(H_2O, l) =75.3\, J\, mol^{-1} \, K^{-1}$ ,
$C_p(H_2O, s) = 36.8\, J\, mol^{-1} \, K^{ -1}$ )
$\Delta H \,(kJ/mol)$ | |
$\frac 12 A \rightarrow B$ | $+150$ |
$3B \rightarrow 2C + D$ | $-125$ |
$E + A \rightarrow 2D$ | $+350$ |