1.

Standard entropies of x_(2) , y_(2) and xy_(3) are 60,40 and 50 "J/K mol"^(-1) respectively for the reaction (1)/(2) x_(2) + (3)/(2) y_(2) to xy_(3) , Delta H = - 30 "kJ" to be at equilibrium the temperature should be.

Answer»

500 K
750 K
1000 K
1250 K

Solution :`Delta S = 50 - ((60)/(2) + (3)/(2) XX 40)`
`= 50 (30+ 60) = - 40 "J/K mol"`
`Delta G = 0`
`therefore Delta H = T Delta S therefore T = (-30 xx 10^(3) )/( - 40) = 750 K`


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