A chemical reaction is spontancous at `298 K` but non spontaneous at `350 K` . Which one of the following is true for the reaction ?

Options

A. `{:(Delta G,Delta H,Delta S),(-,-,+):}`
B. `{:(Delta G,Delta H,Delta S),(+,+,+):}`
C. `{:(Delta G,Delta H,Delta S),(-,+,-):}`
D. `{:(Delta G,Delta H,Delta S),(-,-,-):}`

Answer

D

Explanation

`(1)/(2) N_(2)(g) + (1)/(2) O_(2)(g) hArr NO(g) Delta G= 78` kJ/mole
At equilibrium `Delta G= -2.303RT log_(10)K`
`78 xx 10^(3)= -2.303 xx 8.314 xx 1000 xx log_(10)K`
`log_(10) K= -4.07`
`K= 8.4 xx 10^(-5)`