ΔG is the change in Gibbs energy for a chemical reaction. If it is measured under standard conditions then it is known as the standard Gibbs energy change and has the symbol ΔG⦵. If the value of ΔG⦵ is negative then the reaction is spontaneous under standard conditions whereas if the value of ΔG⦵ is positive then the reaction is non-spontaneous under standard conditions. Spontaneous means that the reaction...