Fish need at least 4ppm dissolved O2 for survival.?

NetherCraft 0

Fish need at least 4ppm dissolved O2 for survival.

1) What is this concentration in mol/L?

2) What partial pressure of O2 above the water is needed to obtain thi concentration at 10*C? (The Henry’s law constant for O2 at this temperature is 1.71 x 10^-3mol/l x atm.)

3 Answers

  • 1) the 4 ppm means 4 grams of O2 for every 1,000,000 grams of sea water.

    convert 4 grams O2 into moles

    = 4 g / (32 grams of O2 per mole of O2) <— molecular mass of O2 is 32 grams

    = 4 / 32

    = 0.125 moles of O2

    scale down to 1 liter (aka 1,000 grams)

    = 0.125 moles * (1,000 grams / 1,000,000 grams)

    = 0.125 moles / 1,000 grams

    = 1.25 * 10^-4 moles of O2 per 1,000 grams of sea water

              and since 1,000 grams is 1 liter

    = 1.25 * 10^-4 moles O2 per L sea water

    2) 1.25 10^-4 moles/L = P 1.71 10^-3 moles / (L atm)

               where P - pressure of O2 above the water
    P = (1.25 * 10^-4) / (1.71 * 10^-3) atm

    P = you calculate

  • Could clean a fish easy — I’ve done it. Can catch and eat crawdads, pick mushrooms without getting poisoned. Haven’t done well with berries and roots but I’m hoping to learn. I’ve watched a deer being done, so at least theoretically I know how, but I’ve never done it myself. And the woman who I watched do it had a lot of advice that started out with “It seems like you should do such-and-such, but if you do that, such-and-such bad thing happens” so I’m betting I’d probably screw up until I got some practice. I know how to set snares for small animals but so far I’ve only used the knowledge on garden pests. However, I’m a very good shot, although not much of a stalker. If I brought a deer in I bet I could find someone else to do it. I CAN build a fire, even in the rain. I’ve had to do it. I can ID a North American sɴᴀκᴇᴅ as to whether it’s poisonous or not, kill it if I can’t avoid it, dig a latrine, set up a bacterial water filter, pitch a tent (no remarks! Snicker), read a contour map, hang groceries (bears), and do the “long slow haul” thing (hike at a very slow pace but keep going for many hours before needing a rest), first aid for injuries, cook over a fire. I know how to back slowly away from bears or big cats and avoid getting attacked. I’ve had to use that one. Never tangled with a gator but I hear the tails are good eating. If I avoided tularemia from eating an improperly butchered/cooked rabbit, or didn’t move my size eleven-and-a-half feet through the brush too loudly to get any game, I think I’d do pretty well. I have done many wilderness treks, and particularly enjoyed camping in the snow, but I carried food with me on all of them, so I guess that’s cheating. HA HA HA HA HA zoology

Also Check This  Symbol for population standard deviation

Leave a Reply

Your email address will not be published. Required fields are marked *