Home
Class 11
CHEMISTRY
If the enthalpy of formation and enthalp...

If the enthalpy of formation and enthalpy of solution of HCl (g) are-92.3kj /mol and -75.14kJ/mol respectively then find the enthalpy of `Cl^(-)`(aq):

A

`-17.16` kJ/mol

B

`-167.44` kJ/mol

C

17.16 kJ/mol

D

None of these

Text Solution

Verified by Experts

The correct Answer is:
B
`HCl(g)+aqrarrH^(+)(aq.)+Cl^(-)(aq.),`
`Delta_(r )H=-75.14`
`-75.14 = Delta_(f)H(H^(+),aq)+Delta_(f)H(Cl^(-),g)-Delta_(f)H(HCl, g)`
`because " "Delta_(f)H(H^(+),aq)=0`
`Delta_(f)H(Cl^(-),aq)=-75.14-92.3`
`=-167.44 " kJ"//"mol"`
Promotional Banner

Topper's Solved these Questions

  • THERMODYNAMICS

    NARENDRA AWASTHI|Exercise Level 1 (Q.1 To Q.30)|6 Videos

  • THERMODYNAMICS

    NARENDRA AWASTHI|Exercise Level 1 (Q.31 To Q.60)|2 Videos

  • STOICHIOMETRY

    NARENDRA AWASTHI|Exercise Level 3 - Subjective Problems|20 Videos

Similar Questions

Explore conceptually related problems

If the standard molar enthalpy of formation of SO _(2 (g)) and SO _(3(g)) is - 296 . 82 kJ mol ^(-1) and -395 . 72 kJ mol ^(-1) respectively, then enthalpy change for the reaction in kJ mol ^(-1) , SO _(2 (g)) + (1)/(2) O _(2 (g)) to SO _(3(g)) , is

The enthalpy of formation (Delta_rH) of methanol, formaldehyde and water -239, -116 and -286KJ mol^-1 respectively. The enthalpy change for the oxidation of emthanol to formaldehyde and water in KJ is

The standard enthalpies of formation of CO_(2) gas and HCOOH_((l)) are -393.7 kJ mol^(-1) and -409.2 kJ mol^(-1) respectively. Which of the following are correct?

The enthalpies of combustion of carbon and carbon monoxide are -390 KJ mol^(-1) and -278 KJ mol^(-1) respectively. The enthalpy of formation of carbon monoxide is

The standard molar enthalpies of formation of cyclohexane (l) and benzene (l) at 25^(@)C "are" -156 and +49kJ mol^(-1) respectively. The standard enthalpy of hydrogenation of cyclohexene (l) at 25^(@)C is -119kJ mol^(-1) . Use these data to estimate the magnitude of the resonance energy of benzene.

The enthalpy of tetramerization on X in gas phase (4X(g) ® X_(4)(g)) " is" -100 kJ/mol at 300K. The enthalpy of vaporisation for liquid X and X_(4) are respectively 30kJ/mol and 72 kJ/mol respectively. DS for tetramerization of X in liquid phase is -125 J/K mol at 300K. What is the DG at 300K for tetramerization of X in liquid phase?

The enthalpy of formation of N_2O_((g)) and NO_((g)) are 82.0 KJ and 90 KJmol^(-1) respectively. The enthalpy of the reaction 2N_2O_((g)) + O_(2(g)) rarr 4NO_((g)) is

If the standard molar enthalpy of formation of CaO_((s)), CO_(2(s)) and CaCO_(3(s)) is -635, -393 and -1207kJ "mol"^(-1) respectively, the Delta_r H^(o.) in kJ mol^(-1) for the reaction CaCO_(3(s)) rarr CaO_((s)) + CO_(2(g)) is

Bond enthalpy of bromine is 194 kJ mol^(-) . If enthalpy of vapourisation of Br_2 is +30 kJ mol^(-) , electron gain enthalpy of Br is -325 kJ mol^(-1) and hydration enthalpy of bromide is -339 kJ mol^(-1) calculate the change in enthalpy for the reaction, 1/2Br_(2)(l) + e^(-) overset(aq)(rarr) Br^(-)(aq) .