For the chemical reaction X ⇋ Y, the standard reaction Gibbs energy depends on temperature T (in K) as ΔrGo (in KJ mol\-1) = 120 - 3/8T. The major component of the reaction mixture at T is :
(1) X if T = 315 K
(2) Y if T = 300 K
(3) Y if T = 280 K
(4) X if T = 350 K
