ThermodynamicsHard
Question
The difference between heats of reaction at constant pressure and constant volume for the reaction
2C6H6(l) + 1502(g) → 12CO2(g) + 6H2 O(l) at 25oC in kJ is :
2C6H6(l) + 1502(g) → 12CO2(g) + 6H2 O(l) at 25oC in kJ is :
Options
A.- 7.43
B.+3.72
C.- 3.72
D.+7.43
Solution
Heat of reaction at constant pressure = ᐃH and at
constant volume = ᐃH
But ᐃH = ᐃU + ᐃnRT
Fro the reaction
2C6H6(l) + 15O2(g) → 12CO2(g) + 6h2O(l)
ᐃn = 12 - 15 = - 3 (Count gasecos molecules only)
and ᐃH - ᐃU = ᐃnRT
= - 3 × 8.314 × (273 + 25)
= - 74327 J ⇒ - 7.43KJ
constant volume = ᐃH
But ᐃH = ᐃU + ᐃnRT
Fro the reaction
2C6H6(l) + 15O2(g) → 12CO2(g) + 6h2O(l)
ᐃn = 12 - 15 = - 3 (Count gasecos molecules only)
and ᐃH - ᐃU = ᐃnRT
= - 3 × 8.314 × (273 + 25)
= - 74327 J ⇒ - 7.43KJ
Create a free account to view solution
View Solution FreeMore Thermodynamics Questions
The efficiency of the reversible heat engine is ηr and that of irreversible heat engine is ηi. Which of the following re...For reaction, 2Cl(g)   → Cl2(g) the signs of ᐃH and ᐃS respectively, are :...The value of log10K for a reaction A ⇋ B is ( Given : áƒfHo298K = - 54.07 kJ mol-1, áƒrSo298K = 10JK-1mol-1 and R = ...A liquid is adiabatically expanded from state – I to state – II, suddenly by a single step, as shown in the figure then...If all the following gases are in monoatomic form, then which of the following has greater entropy?...