In order for fish to survive, the dissolved oxygen content of a lake or stream must be at least 3 µg mL-1. A particular lake has pH = 6.5 and T = 25oC. What is the molar DO concentration (no units req.)?

Spontaneity tell us the direction of the reaction, but not how fast it goes. gibbs free energy brings together enthalpy, entropy and temperature in one easy formula. g = h - ts. and, finally the sign of delta g is always negative for a spontaneous reaction.

Acovalent bond is formed between the two hydrogen bonds