JEE AdvancedThermochemistryHard
Question
Heat of neutralisation of CsOH with all strong acid is 13.4 kcal mol-1. The heat released on neutralisation of CsOH with HF (weak acid) is 16.4 kcal mol-1. of ionisation of HF is
Options
A.
3.0 kcal
B.-3.0 kcal
C.6.0 kcal
D.0.3 kcal
Solution
i. H+ + OH- → H2O           áƒH1 = - 13.4 kcal
ii. OH- + HF → H2O + F-    áƒH2 = - 16.4 kcal
iii. HF → H+ + F-           áƒH3 = ?
áƒH3 = áƒH2 - áƒH1
= -16.4 - (-13.4) = -3.0 kcal
ii. OH- + HF → H2O + F-    áƒH2 = - 16.4 kcal
iii. HF → H+ + F-           áƒH3 = ?
áƒH3 = áƒH2 - áƒH1
= -16.4 - (-13.4) = -3.0 kcal
Create a free account to view solution
View Solution FreeMore Thermochemistry Questions
NH3(g) + 3Cl2(g) → NCl3(g) + 3HCl(g) ; ᐃH1N2(g) + 3H2(g) → 2NH3(g) ; ᐃH2H2(g) + Cl2(g) → 2...Standard enthalpy of formation of gaseous ethane, ethene and benzene from gaseous atoms are −2839, −2275 and −5506 kJ/ m...ΔfHo for NF3(g) is −113 kJ/mol. Bond energy for the N–F bond is 273.5 kJ/mol. The bond energies of N2 and F2, if their m...The reaction of zinc metal with hydrochloric acid was used to produce 1.5 moles of hydrogen gas at 298 K and 1 atm press...The standard molar enthalpies of formation of cyclohexane (l) and benzene(l) at 298 K are −156 and +49 kJ/ mol, respecti...