ThermochemistryHard
Question
The ᐃHof for CO2(g), CO(g) and H2O(g) are - 393.5 - 110.5 and 241.8 kJ mol -1 respectively. The standard enthaly change (in kJ mol -1 ) for the reaction CO2(g) + H2(g) → CO(g) + H2O(g) is :
Options
A.+524.1
B.+41.2
C.- 262.5
D.- 41.2
Solution
Given that
C + O2 → CO2 ; ᐃHo = - 393.5 KJ ....(i)
C +
O2 → CO ; ᐃHo = - 110.5KJ ....(ii)
H2 + O2 → H2O ; ᐃHo = - 241.8 KJ ....(iii)
now making mathematical operation
(ii) + (iii) - (i)
C + O2 + H2 O2 - C - OO2 → CO + HO2O - COO2
COO2 + HO2 → CO + HO2O
OR ᐃHo = (-110.5) + (-241.8) -(-393.5)
= + 41.2KJ mol -1
C + O2 → CO2 ; ᐃHo = - 393.5 KJ ....(i)
C +
O2 → CO ; ᐃHo = - 110.5KJ ....(ii)H2 +
O2 → H2O ; ᐃHo = - 241.8 KJ ....(iii) now making mathematical operation
(ii) + (iii) - (i)
C +
O2 + H2 O2 - C - OO2 → CO + HO2O - COO2COO2 + HO2 → CO + HO2O
OR ᐃHo = (-110.5) + (-241.8) -(-393.5)
= + 41.2KJ mol -1
Create a free account to view solution
View Solution FreeMore Thermochemistry Questions
If the bond dissociation energies of XY, X2 and Y2 (all diatomic molecules) are in the ratio of 1:1:0.5 and ᐃfH fo...When 1.0 g of oxalic acid (H2C2O4) is burned in a bomb calorimeter whose heat capacity is 8.75 kJ/K, the temperature inc...A solution of 500 ml of 2 M-KOH is added to 500 ml of 2 M-HCl and the mixture is well shaken. The rise in temperature T1...Enthalpy of neutralisation of CH3COOH by NaOH is - 50.6 kJ/mol and the heat of neutralisation of a strong acid with NaOH...The enthalpy of formation of KCl(s) from the following data is(i) KOH(aq) + HCl(aq) → KCl(aq) + H2O(l): ΔH = −13.7 kcal(...