Among the quantities, density $\left(\mathrm{\rho }\right)$, temperature $\left(\mathrm{T}\right)$, enthalpy $\left(\mathrm{H}\right)$, heat capacity $\left({\mathrm{C}}_{\mathrm{p}}\right)$, volume $\left(\mathrm{V}\right)$ and pressure $\left(\mathrm{P}\right)$, a set of intensive variables are:

Which of the reaction does not defines molar ${\mathrm{\Delta H}}_{\mathrm{f}}°$?

For a particular reversible reaction at temperature $\mathrm{T}, \mathrm{\Delta H}$ and $∆\mathrm{S}$ were both found to be $+\mathrm{ve}$. If ${\mathrm{T}}_{\mathrm{e}}$ is the temperature at equilibrium, the reaction would be spontaneous when:

[Hint: $∆\mathrm{G}$ should be negative. $∆\mathrm{G}=∆\mathrm{H}-{\mathrm{T}}_{\mathrm{e}}∆\mathrm{S}=0$]