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The microorganisms in a waste treatment pond are exposed to 35 mg/L of easily degradable organic compounds with a typical composition C5H10O5. The standard molar Gibbs energy of formation of these compounds is -2797 kJ/mol. The pond is at pH 7.3, its temperature is 25ºC, and its alkalinity is 2 x 10-3 eq/L. The overall reaction for the organic matter is:C5H10O5+ 5O2(aq) ? 5H2CO3(aq)
The operator of the treatment facility has suggested that the treatment efficiency could be improved by bubbling air through the water to encourage biological activity. Would the organisms find the environment in the untreated water more favourable, less favourable, or identical (from an energy standpoint) after equilibration with air? Explain briefly - a calculation wouldn't hurt to make your point.
If 20.0 dm3 of methane, CH4, react with 200.0 dm3 of air at STP, calculate the dm3 of carbon dioxide gas produced.
The biochemical oxygen demand (BOD) is the capacity of organic and biological matter in natural water to consume oxygen. It is determined experimentally by measuring the oxygen concentration in a sealed sample before and after a 5-day incubation p..
why would it be difficult to determine the point where the limiting reactant changes if 13.0 ml of 1m hclaq were used
how much energy is required to warm 100g of H2O from 20 degrees celcius to 80 degrees celcius if it is initially in a 140g glass flask? the specific heat of water is 4.18 J/g degree celcius.
What is the millimolar solubility of oxygen gas, in water at 16 , if the pressure of oxygen is 1.00 ?
A gas has a mass of 0.305 g, volume of 25 ml at 2 ATM and 0 degrees Celsius. The gas consists of bromine and fluorine. What is the molecular weight and the chemical formula
An empty vial weights 31.45 g. If the vial weighs 179.56 g when filled with liquid mercury (d=13.53g/cm3), what is its volume
What mass of carbon dioxide is present in 1.00m^3 of dry air at a temperature of 25c and a pressure of 731torr? Calculate the mass percentage of oxygen in dry air.
If 0.0598 moles of potassium hydroxide are added to 250 ml of this buffer, what is the pH of the resulting solution? (Assume that the volume change does not change upon adding potassium hydroxide)
A sulfuric acid solution is 54.0% H2SO4 by mass and has a density of 1.59 g/mL at 20 C. What is the molarity and molality of the H2SO4 solutions
Explain Solid State Chemistry, 1) Write the balanced chemical equation for Fe2O3+2Al?2Fe+Al2O3 using the lowest possible whole number coefficients.
a student dissolves 1.50g of copperii nitrate in water. after adding aqueous sodium carbonate solution which contains
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