w = − J w = − . kJ 11th Std Chemistry 11th Std Chemistry - - - - . SOLUTION : Given : T i = K T f = . K k = .
kJ K − m = .5g M m = heat evolved = k ΔT = k (T f − T i ) = . kJ K − ( . − )K = .125kJ ΔH c = × kJ mol − ΔH c = kJ mol − . SOLUTION : Given : T sys = C = ( + ) = K T surr = C = ( + ) = K q = J ΔS sys = q T sys = − = − .
JK − ΔS surr = q T sys = + = + . JK − ΔS univ = ΔS sys + ΔS surr ΔS univ = − . JK − + . JK − ΔS univ = .
JK − . SOLUTION : Given : n = 1mole P = . atm V= Lit T = ? q= J ΔS = q ΔS = q PV nR ΔS = nRq PV ∆= × S lit atm K J atm lit ∆= × S lit atm K J atm lit ΔS = .
JK − . SOLUTION: Given : ΔH f (NaCl) = . kJ = 30400 J mol − ΔS f (NaCl) = . JK − mol − T f = ?
∆ = ∆ = ∆ ∆ S H H S f f f f f f 11th Std Chemistry 11th Std Chemistry - -