1.

From the following data, mark the option (s) where DeltaH is correctly written for the given reaction. Given: H^(+)(aq)+OH^(-) (aq) rarr H_(2)O(l)""DeltaH= -57.3 kJ DeltaH_("solution") of HA(g)= -70.7 kJ/mol Delta_("solution") of BOH(g)=20 kJ/mol DeltaH_("ionization") of HA=15 kJ/mol & BOH is a strong base

Answer»

`{:("Reaction",DeltaH_(R)" (kJ/mole)"),(HA(aq)+BOH(aq) rarr BA(aq)+H_(2)O,-42.3):}`
`{:("Reaction",DeltaH_(R)" (kJ/mole)"),(HA(g)+BOH(g) rarr BA(aq)+H_(2)O,-93):}`
`{:("Reaction",DeltaH_(R)" (kJ/mole)"),(HA(g) rarr H^(+) (aq)+A^(-)(aq),-55.7):}`
`{:("Reaction",DeltaH_(R)" (kJ/mole)"),(B^(+)(aq)+OH^(-)(aq) rarrBOH(aq),-20):}`

Solution :`HA(aq)+BOH(aq) rarr BA(aq)+H_(2)O`
`DeltaH=-57.3+DeltaH_("ion")HA`
`=-42.3` OPTION (A) correct
`HA(g)+BOH(g) rarr BA(aq)+H_(2)O`
`DeltaH=DeltaH_("solution")HA+DeltaH_("solution")BOH-57.3+15`
`=-93` option (B) correct
`HA(g) rarr H^(+) (aq)+A^(-) (aq)`
`DeltaH=DeltaH_("solution")+DeltaH_("ions")=-55.7 kJ` option (C) is correct
`:. BOH` is strong base `:. DeltaH_("ion")=0`
`:. B^(+) (aq)+OH^(-)(aq) rarr BOH(aq) DeltaH=0`


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