Which of the followings is true about G0'? A. G0' can be determined using Keq' B. G0' indicates if a reaction can occur under non-standard conditions C. G0' is always positive D. G0' is determined at pH 7 and temperature 298 K

A and D are true, while B and F statements are false.

Explanation:

A) True. Since the standard gibbs free energy is

ΔG = ΔG⁰ + RT*ln Q

where Q = [P1]ᵃ ... / ([R1]ᵇ ...), representing the ratio of the product of concentration of chemical reaction products P and the product of concentration of chemical reaction reactants R

when the system reaches equilibrium ΔG=0 and Q=Keq

0 = ΔG⁰ + RT*ln Q → ΔG⁰ = (-RT*ln Keq)

therefore the first equation also can be expressed as

ΔG = RT*ln (Q/Keq)

thus the standard gibbs free energy can be determined using Keq

B) False. ΔG⁰ represents the change of free energy under standard conditions. Nevertheless, it will give us a clue about the ΔG around the standard conditions. For example if ΔG⁰>>0 then is likely that ΔG>0 (from the first equation) if the temperature or concentration changes are not very distant from the standard conditions

C) False. From the equation presented

ΔG⁰ = (-RT*ln Keq)

ΔG⁰>0 if Keq<1 and ΔG⁰1

for example, for a reversible reaction ΔG⁰ will be <0 for forward or reverse reaction and the ΔG⁰ will be >0 for the other one (reverse or forward reaction)

D) True. Standard conditions refer to

T = 298 K

pH = 7

P = 1 atm

C = 1 M for all reactants

Water = 55.6 M