L6 5 What is the primary advantage of temperature program in gas * ?chromatography It improves the detector response It facilitates the use of the electron capture detector It increases the number of theoretical plates of the column It facilitates the analysis of mixtures of substances with widely differing vapor pressures
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- Calculate the values of vrms, vmp, and vmean for Cl2 (70.90 g mol-1) at 25 °C4.Discussed the Purposed of the Golden rules in the practice of Forensic Chrmistry.A student obtained an average PV value of 42,000 in column ( of the data table. If the syringe had een able to be adjusted to a volume of 35.0 mL, what would the pressure be inside the flask? emember that PV = k and the volume you used includes the flask as well as the syringe. Given that the volume of the flask and the syringe is 553. Round to the correct sig figs.
- Calculate the density in molecules/cm3 for a gas at 10 torr and at 1 x 10-7 torr. 10-7 torr is the typical pressure in a mass spectrometer. show work please :)An analyst obtained the following data for the percent compound Z in triplicates (n=3) of an insecticide preparation: 7.47, 6.98, and 7.27. Calculate the 90% confidence limit for the mean of the data assuming that only information about the precision of the method is the precision for the three data points.Ozone is a trace atmospheric gas which plays an important role in screening the Earth from harmful ultraviolet radiation, and the abundance of ozone is commonly reported in Dobson units. Imagine a column passing up through the atmosphere. The total amount of O3 in the column divided by its cross-sectional area is reported in Dobson units with 1 Du = 0.4462 mmol m−2. What amount of O3 (in moles) is found in a column of atmosphere with a cross-sectional area of 1.00 dm2 if the abundance is 250 Dobson units (a typical midlatitude value)? In the seasonal Antarctic ozone hole, the column abundance drops below 100 Dobson units; how many moles of O3 are found in such a column of air above a 1.00 dm2 area? Most atmospheric ozone is found between 10 and 50 km above the surface of the Earth. If that ozone is spread uniformly through this portion of the atmosphere, what is the average molar concentration corresponding to (a) 250 Dobson units, (b) 100 Dobson units?
- A student performed the experiment described in this module, using 7.00 mL of a 1.8% H2O2 solution with a density of 1.01 g mL-1. The water temperature was 20 ° C, and the barometric pressure in the laboratory was 30.02 in. Hg. After the student immersed the yeast in the peroxide solution, she collected 45.1 mL of O2. (11) Calculate the percent error for the experiment.1) Mass of flask, aluminum foil, and rubber band 68.45g 2) Temp. Of boiling, water 98.20 0C 3) Barometric pressure 755 mmHg 4) Volume of flask (volume of vapor occupies flask) 152 ml 5) Mass of flask, aluminum foil, rubber band, and condensed vapor 68.60g 6) Mass of condensed vapor is (5)-(1) Find Molecular weight of unknown ______ g / mol Calculation PV = (m/M)RT) è M = (mRT) / PV = ? Unknown liquid- Based on Molecular weight determine which unknown below has this molecular weight: Methanol, Ethanol, Isopropanol, Propanol. UNKNOW IS : __________________________A chemist obtained the following data for the percent compound Z in triplicates (n=3) of an insecticide preparation: 7.47, 6.98, and 7.27. Calculate the 90% confidence limit for the mean of the data assuming that only information about the precision of the method is the precision for the three data points. 7.24 ± 0.74% 7.24 ± 0.13% 7.24 ± 0.42% 7.24 ± 0.27%
- A chemist obtained the following data for the percent compound Z in triplicates (n=3) of an insecticide preparation: 7.47, 6.98, and 7.27. Calculate the 90% confidence limit for the mean of the data assuming that only information about the precision of the method is the precision for the three data points.A volumetric calcium analysis on triplicate samples of the blood serum of a patient believed to be suffering from a hyperparathyroid condition produced the following data: mmol Ca/L = 3.15, 3.25, 3.26. What is the 95% confidence interval for the mean of the data, assuming no prior information about the precision of the analysis?1. Determine the value of the ideal gas constant.2. Compare your value of ideal gas constant to the literature value, and calculate the percent error. Mg(s) + 2 HCl(aq) -> H2 (g) + MgCl2(aq) given: Mass of Mg Ribbon: 0.0325g10 mL of 6 M HCl Barometric Pressure: 101.8 kPa Room Temperature: 24.5 oC Water Vapour Pressure: 23.1 mmHg Mass of Mg Ribbon: 0.0325g Initial volume of the Burette: 1.55 mL Final Volume of the Burette: 36.35 mL Height of the Water Column in the Burette: 167.0 mm