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The answer is always a positive number or zero. In this case just change the sign....+6 is your answer.
what percent of change : from 280 to 126
You change three percent to a decimal.
It is a percentage change - unless the increase changes a negative number to a positive number or a decrease does the opposite.
Gibbs free energy (ΔG) will always be negative for a spontaneous process occurring at constant temperature and pressure. This typically occurs when the change in enthalpy (ΔH) is negative (exothermic reactions) and the change in entropy (ΔS) is positive, leading to a favorable increase in disorder. Additionally, even if ΔH is positive, a sufficiently large positive change in entropy can also result in a negative ΔG at high temperatures, according to the equation ΔG = ΔH - TΔS.