1.

Find Delta_(r)U^(@) for the reaction 4HCl (g) + O_(2) (g) rArr 2Cl_(2) (g) + 2H_(2)O (g) at 300 K. Assume all gases are ideal {:("Given",H_(2) (g) + Cl_(2) (g) rarr 2HCl (g),Delta_(r) H_(300)^(@) - 184.5 kJ//"mole",),(,2H_(2) (g) + O_(2) (g) rarr 2H_(2)O (g),Delta_(r) H_(300)^(@) = - 483 kJ//"mole" ("Use" R = 8.3 J//"mole"),):}

Answer»

111.5 KJ/mole
`-109.01 kJ//"mole"`
`-111.5 kJ//"mole"`
NONE

Solution :`4HCl+O_(2) SQUARE hArr 2Cl_(2)+2H_(2)O""DeltaH=-114`
`DeltaU=DeltaH-Deltan_(g)RT=-114+(1xx8.314xx10^(-3) xx300)`
`=-111.5" kJ mol"^(-1)`


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