Calculate the enthalpy change for the given reaction from data provided (kJ/mole)
`{:(HA(g),+,B(g),rarr,AHB(s)),("(weak acid)",,"(weak acid)",,"(Salt)"):}`
`DeltaH_("neutralization") {HA(aq) ["at infinite dilution"]//B(aq)["at infinite dilution"]}=-40" kJ/mole"`
`{:(DeltaH_("solution")[HA(g)],=-10" kJ/mole",{"at infinite dilution"}),(DeltaH_("solution")[B(g)],=-5" kJ/mole",{"at infinite dilution"}),(DeltaH_("solution")[HAB(s)],=+8" kJ/mole",{"at infinite dilution"}):}`

Options

A. `-36`
B. `-63`
C. `-45`
D. `-37`

Answer

B

Explanation

`{:(" "HA(g),+," "B(g),overset(DeltaH)(rarr)," "AHB(s)),(+nH_(2)O darrDeltaH_(1),,+nH_(2)O darr DeltaH_(2),,+nH_(2)O darr DeltaH_(4)),(" "HA(aq),+," "B(aq),overset(DeltaH_(3))(rarr)," "A^(-) (aq)+B^(+)(aq)):}`
`DeltaH=DeltaH_(1)+DeltaH_(2)+DeltaH_(3)-DeltaH_(4)`
`=-10-5-8-40=-63" kJ/mole"`