Isothermal equation of chemical reaction Reaction 1D++…→gG+hH+ A, Gm=4,GS(T)+RTIn(G/p)(H/ps)h (f/p3)(f/p53)° △Gm()+RTng Where Q is the reaction quotient 4上一内容下一内容◇回主目录 返回
上一内容 下一内容 回主目录 返回 g h G H r m d e D r E m ( / ) ( / ) ( ) ln ( / ) ( / ) f p f p G T RT f p f p G = + $ $ $ $ $ r m = + G T RT Q ( ) ln f $ d e g h D E G H + + → + + Reaction: Isothermal equation of chemical reaction Where Q is the reaction quotient
The thermodynamic equilibrium constant When the reaction is at equilibrium △G=0 △Gm(T) RTIng/p (n/p3) (fD/p3)(f/p3)° -RINks s is the thermod ynamic equilibrium constant It should be noticed that eq provides a way of measuring the standard gibbs functions of reactions 4上一内容下一内容令回主目录 返回
上一内容 下一内容 回主目录 返回 When the reaction is at equilibrium， r G m = 0 g h G H r m d e D E ( / ) ( / ) ln ( / ) ) ) ( / ( f p f p RT f p f T p G = − $ $ $ $ $ = −RT K ln f $ is the thermodynamic equilibrium constant. K f $ The thermodynamic equilibrium constant It should be noticed that eq.provides a way of measuring the standard Gibbs functions of reactions
Predict the direction of reaction Use the vant Hoff equation △Gn=- RTIn k+ RTInQ For pg reaction △Gn=-RTnK+ RTIng P kp>Q △G.<0 from left to right Kp<Q A G>o from right to left $ △Gm=0 at equilibriun 4上一内容下一内容令回主目录 返回
上一内容 下一内容 回主目录 返回 Predict the direction of reaction Use the van’t Hoff equation： r m = − + G RT K RT Q ln ln f f $ r m = − + G RT K RT Q ln ln p p $ For pg reaction: K Q G p p r m 0 $ from left to right K Q G p p r m 0 $ from right to left K Q G p p = = r m 0 $ at equilibrium
Relation of constant and equation △G(T)=-RTnK8 Subscript m denoting the extent of reaction is unity 1.e. I mol △G(T) s referred to K Example: (1)H2(g)+I2(g)=H(g)△G2=2△GB (2)H2(g)+I2(g)=2HI(g)K2=(K $ f,1 )2 4上一内容下一内容令回主目录 返回
上一内容 下一内容 回主目录 返回 Subscript m denoting the extent of reaction is unity i.e. 1 mol . r m G T( ) $ K f $ Relation of constant and equation r m = − G T RT K ( ) ln f $ $ = r m,2 r m,1 G G 2 $ $2 ,2 ,1 ( ) K K f f = $ $ Example： H (g) I (g) 2HI(g) 2 + 2 = H (g) I (g) HI(g) 2 2 1 2 2 1 （1） + = （2） is referred to