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In the COD measurement of a raw wastewater sample, initial K2Cr2O7 concentration added into the wastewater sample is 3.000 g/L. After the redox reaction has reached an equilibrium, the K2Cr2O7 concentration has been reduced to 1.824 g/L. Assuming in the redox reaction, the Cr in K2Cr2O7 is reduced to Cr3+. What is the COD of the wastewater sample in mg/L? Please show all work.
The latent heat of fusion of water at 0oC is 335 kJ/kg. How much does the entropy of 1 kg of ice change as it melts into water
although we usually think of substances as burning only in oxygengas the process of rapid oxidation to produce a flame
the heat capacity of a bomb calorimeter is found to be 5.68 kjoc. when a 1.652 g sample of glucose is burned in the
What is the pH of the saturated solution of Ca(OH)2 (Ksp = 1.3 x 10-6). 12.14 8.11 11.06 12.37 2. To a 1.00 L solution containing 1.00 x 10-3 mole each of Ca2+, Sr2+, and Ba2+, 0.0100 mole of Na2SO4 solid is added
At what pH would the side chain of histidine exist predominately in a form that could be involved in an ionic bond?
Which species from the above reactions would be most active (oxidize most easily). Write two complete reactions from the above list that happen spontaneously.
Assume a gasoline is isooctane, which has a density of 0.692 g/mL. What is the mass of 2.5 gal of the gasoline (1 gal = 3.78 L)? Answer in units of kg.
a sample of he gas 3.0 l at 5.6 atm and 25degc was combined with 4.5 l of ne gas at 3.6 atm and 25degc at constant
How many moles of each are present in the eq mixture b)Calculate the equilibrium constant
How much Tris (1.0 M) (MW: 121.1 g/mol) and EDTA (0.2M) (MW: 372.2 ) solutions are used to prepare a 100ml of TE buffer (10mM Tris and 1mM EDTA)
how much heat in is evolved or absorbed in the reaction of 2.28 grams of sodium na with water h2o express your answer
20 kg of gas burns with 83kg of oxygen produces how much total mass of carbon dioxide and water?
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