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Poorly treated municipal wastewater is dis- charged to a stream. The river flow rate upstream of the discharge point is Qu = 8.7 m3/s. The discharge occursataflowofQd=0.9m3/sandhasaBODcon- centration of 50.0 mg/L. Assume the upstream BOD concentration is negligible. (a) What is the BOD concentration just downstream of the discharge point? (b) If the stream has a cross-sectional area of 10 m2, "what is the BOD concentration 50 km downstream? (BOD is removed with a first-order decay rate con- stant equal to 0.20/day.
For the reaction A + B C, the rate constant at 215 degrees C is 5.0 X 10^-3 and the rate constant at 452 degrees C is 1.2 X 10^-1 a) What is the activation energy in kJ/mol?
Did the. Temperature oof the water rise or fall when the nh4no3 was added? Explain this in terms of heat ttransfer.
What is the minimum amount of 6.2M H2SO4 necessary to produce 25.7g of H2 (g) according to the following reaction?
Compute pH and [OH-] for each of the following solutions. (a) 8.1×10-2M Na2CO3, (b) 0.15M NaCN
The paint formerly used on some storage tanks contained aluminum powder, which reflected heat from the surface of the tanks. Why did experts recommend grounding these tanks
a 55.0g piece of copper wire is heated, and the temperature of the wire changes from 19.0C to 86.0C. The amount of heat absorbed is 1.4 kilojoules. What is the specific heat of copper?
The exothermic chemical reaction CO(g) + H2O(g) CO2(g) + H2(g) has Kc = 0.034 at 25°C. We currently have a flask containing all the components listed in this equation at equilibrium at 25°C. Subsequently, we will either (1) add some H2 to the flas..
Calculate the value of E^o cell for the reaction 2Ag(s) + Ca2+ (aq) yields 2Ag+(aq)+Ca(s), using the standard reduction potentials
Calculate H per mole of CaCl2 (in kJ) for the reaction under the above conditions. Aside, the ?H per mole for dilution depends on the process.
A water sample has a pH of 8.21 and a total calcium concentration of 143 ppm. What is the total alkalinity of the water?
what is the sum of ALL the coefficients in the equation?
A gas occupying a volume of 395 mL at a pressure of 0.970 atm is allowed to expand at constant temperature until its pressure reaches 0.541 atm. What is its final volume?
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