Question

Which of the given conditions leads to a negative free energy value (spontaneous reaction)?

1. Highly positive enthalpy and highly negative entropy
2. Slightly negative enthalpy and highly negative entropy
3. Highly positive enthalpy and slightly positive entropy
4. Highly negative enthalpy and highly positive entropy

Answer 1

Use dGo = dHo - TdSo, then plug in each scenario listed as answers and see which is more likely to give a negative dGo. Negative dGo means a spontaneous reaction. Here is how I would do answer 1.
dG = dH - TdS
........+++ - (---) so that give + value for dH and a + value for TdS which gives a + value for dG which means non-spontaneity. So answer 1 can't be right. Do the same for answers 2,3,4 and decide which is more likely to give a - value for dG.

Answer 2

thakns dr strash