Freshwater eels make notorious aquatic pets and are quite a challenge to keep in aquariums. This is primarily because they are more active and require a higher concentration of dissolved oxygen to survive. You are considering whether to buy an oxygen filter for your eel (that you've unfortunately bought before!). Henry's constant for oxygen in water is 7.69 x 10-2 mol kg bar and the eel needs 0.95 mol kg- of dissolved oxygen content to survive. Determine the concentration of dissolved oxygen under STP conditions.