A work-backwards-with-what-you're-given pH problem.104422
I've posted a few times before and have gotten really great results thanks to OTA #104422...but this one (and a bunch like it) are killing me slowly. I need to SEE how it's done. Calculate the pH of CO2-saturated water at 25 degrees C, given that the CO2 concentration in air is 320 and that for carbon dioxide the Henry's Law ...continues
Another work-backwards-to-get-the-answer problem?
**Assume that a waste contains 340.0 mg/L of biodegradable CH2O and is processed through a 200000.0 L/day sewage treatment plant which converts 40% of the waste to CO2 and H2O. Calculate the volume of air (at 25 degrees, 1 atm) required for this conversion. Assume that the O2 is transferred to the water with 20% efficiency**
I'm really lost, I'd like to see how its done, I have approx. 15 more to do.
What is the fraction of NTA present after HT2- has been brought to equilibrium with solid PbCO3 at pH 7.00, in a medium in which [HCO3-] = 2.00E-3 M?
Converting and calculating percentages . Again, I just need to see ONE of these (hopefully)!!
Assume that the wet limestone process requires 1 metric ton of calcium carbonate to remove + 85.0 % of the sulfur from 4 metric tons of coal containing + 10.0 % S Assume that the sulfur product is calcium sulfate. Calculate the percentage of the limestone converted to calcium sulfate.
Another work-backwards-to-get-the-answer problem - FOR OTA 104422
THIS IS FOR OTA 104422 (Note: This question was posted once already and the response received was incorrect. Thus, it is being reposted SPECIFICALLY for OTA 104422) The questions/assignments are coming faster than I can complete them! I'm going to try and post a series of questions that are NOT related in content (I'm hopi ...continues
Env. Chem ? re: masses, ppm, and room dimensions
The computer allows 12 tries on any question and I've already exhausted 3 tries. Can someone show this to me, step-by-step? I have only 4 others like it, but my math skills are holding me back.***** What mass of formaldehyde gas (in grams) must be released from building materials, carpets, etc. in order to produce a concentra ...continues
(5) The lowest energy photon which is able to split an oxygen molecule has a wavelength of 280.0 nm. Based on this, what is the bond energy of the oxygen molecule in kJ/mol?
These are killing me. #104422 has had the most luck, but I need help!! Anyone?
(7) The Arrhenius equation (see your introductory chemistry textbook) relates reaction rates to temperature via the activation energy. Calculate the ratio of the rates at -30 degrees C (a typical stratospheric temperature) for two biomolecular reactions having the same Arrhenius A factor and initial concentrations , one of which ...continues
Please only respond if you are 100% sure as this question has already been posted once. (10) The threshold/NOEL level found for a particular chemical from animal studies is 0.003 mg/kg body weight per day. The only source for the chemical is freshwater fish, where it occurs at an average level of 0.2 ppm. What is the maximum ...continues
Please only respond if you are 100% sure as this question has already been posted once. 12) (contributions from HCO3-, CO32, and OH-) at [H+] = 4.69E-11, what is the percentage contribution to alkalinity from CO32? PLEASE NOTE: This is the second time that this question has been posted as the first response received was ...continues
