ThermodynamicsMedium
Question
In which of the following reactions, standard reaction entropy changes (ᐃSo) is positive and standard Gibb′s energy changes (ᐃGo) decreases sharply with increasing temperature ?
Options
A.C (graphite) + 1/2O2(g) → CO(g)
B.CO(g) + 1/2 O2(g) → CO(g)
C.Mg(s) + 1/2 O2(g) → MgO(s)
D.1/2 C (graphite) + 1/2 O2(g) → 1/2CO2 (g)
Solution
Amonge the given reactions only in the case of
C (graphite) + 1/2 O2(g) → CO(g)
entropy increases because randomness (disorder) increases Thus, standard entropy changes (ᐃSo) is positive.
Moreover, it is a combustion reaction and all thecombustion reactions are generally exothermic, i.e.,
ᐃHo = - ve
We know that
ᐃGo = ᐃHo - TᐃSo
ᐃGo = - ve - T(+ ve)
Thus as the temperature increases, the the value of ᐃGo decreases.
C (graphite) + 1/2 O2(g) → CO(g)
entropy increases because randomness (disorder) increases Thus, standard entropy changes (ᐃSo) is positive.
Moreover, it is a combustion reaction and all thecombustion reactions are generally exothermic, i.e.,
ᐃHo = - ve
We know that
ᐃGo = ᐃHo - TᐃSo
ᐃGo = - ve - T(+ ve)
Thus as the temperature increases, the the value of ᐃGo decreases.
Create a free account to view solution
View Solution FreeMore Thermodynamics Questions
In which of the following processes entropy increases?A. A liquid evaporates to vapour.B. Temperature of a crystalline s...Five moles of an ideal gas expand isothermally and reversibly from an initial pressure of 100 atm to a final pressure of...When a solid melts reversibly...Match the List-I with List-II List-I (Isothermal process for ideal gas system) List-II Work done ( $\mathbf{V}_{\mathbf{...Each of the vessels 1 and 2 contain 1.2 moles of gaseous helium. The ratio of the volume of vessels is V2/V1 = 2.0, and ...