1.

Carafully observe the given diagrams which indicates standard enthalpy of formation of different states of one mole Mg and 2 mole Cl atom and match the entries in column I and II provided.

Answer»


Solution :(A) `MG(s) RARR Mg^(+2)(g) rarr Mg^(+2) (AQ)`
`DeltaH=2360-[1110+790]`
`=460" kJ/mole"`
(B) `Cl_(2)(g) rarr 2Cl (g) rarr 2Cl^(-) (aq)`
For TWO `CL^(-) (aq) DeltaH=240-1490=-1250`
For `Cl^(-) (aq)=-1250/2 =-625" kJ/mole"`
(C) `Mg^(+2)(g) rarr Mg^(+2) (aq)`
`DeltaH=-790-1110=-1900" kJ/mole"`
(D) `MgCl_(2) rarr Mg^(+2) +2Cl^(-) (g)`
`Delta=2510" kJ/mole"`


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