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A fixed mass of a gas occupies 100cm cubed ,at-15cm cubed and 650mmHg pressure at what temperature will it have a volume of 150cm cubed if the pressure is adjusted to 680 mmHg?
Find the molarity of 45.0 g NaC1 in 500.0 mL
Calculate the free energy change for the reaction shown below at 25oC. 2NO + O2 → NO3
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Application limitations and strength of Mossbauer spectroscopy
Working principle of Mossbauer spectroscopy
Methanol is manufactured industrially by the reaction CO(g) + 2H2(g) <-> CH3OH(g). A gaseous mixture at 500K is 0.020 M CH3OH; 0.10M CO; and 0.10M H2. Calculate the equilibrium constant for the reation if the temperature is 300K. At what side will the equilibrium lie?
Any remaining solid impurities are removed by filtration before continuing with the analysis. In a typical total analysis method, the procedure might read
After digesting the sample in a beaker, remove any solid impurities by passing the solution containing the analyte through filter paper, collecting the filtrate in a clean Erlenmeyer flask. Rinse the beaker with several small portions of solvent, passing these rinsings through the filter paper and collecting them in the same Erlenmeyer flask. Finally, rinse the filter paper with several portions of solvent, collecting the rinsings in the same Erlenmeyer flask.
For a typical concentration method, however, the procedure might state
After digesting the sample in a beaker, remove any solid impurities by filtering a portion of the solution containing the analyte. Collect and discard the first several mL of filtrate before collecting a sample of approximately 5 mL for further analysis.
Explain why these two procedures are different.
A method for the analysis of Ca2+ in water suffers from an interference in the presence of Zn2+. When the concentration of a Ca2+ is 50 times greater than that Zn2+, an analysis for Ca2+ gives a relative error of 2.0%. What is the value of the selectivity coefficient for this method?
A sample is analyzed to determine the concentration of an analyte. Under the conditions of the analysis the sensitivity is 17.2 ppm-1. What is the analyte’s concentration if S total is 35.2 and S reag is 0.6?
