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A sample of oxygen is collected over water at a total pressure of 616.8 mmHg at 30 deg Celsius. the vapor pressure of water at 30 deg celsius is 31.8 mmHg. What is the partial pressure of the O2?
The mass of the crucible, cover and sample of Ti was 36.383 g. Following the reaction of the Ti metal with Oxygen, the contents of the crucible, cover and reaction mixture was heated to a constant mass of 37.472 g. Determine the mass of the oxide ..
Devise a plan to calculate the mass of air that was contained in the clean dry stoppered flask, using the mass measurements you will make during the experiment. the calculation will require another density value besides the density of air.
If 3.98 g of copper was recovered and you started with 9.10 g of copper (II) chloride, then what is the percent yield of the reaction ?
lead on leaves by a roadside was measured spectrophotometrically by reaction with dithizone. The standard deviation for a triplicate analysis was 2.3 ppm.
A 1.70-g sample of a large biomolecule was dissolved in 14.0 g of carbon tetrachloride. The boiling point of this solution was determined to be 77.85°C.
What will be the experimental enthalpy of reaction when 0.5000g of zinc reacts with 20.00mL of 1.500M HCl, changing the temperatrure of the solution
What is the probability of populating the first excited vibrational state (n = 1) at 298 K? Does isotopic substitution affect the probability? Would the intensity of absorption peaks be affected by isotopic substitution?
Calculate the amount of heat required to completely sublime 19.0 g of solid dry ice CO2 at its sublimation temperature. The heat of sublimation for carbon dioxide is 32.3 kJ/mol.
Which of these is not a protease that acts in the small intestine?
Describe the preparation of 1L solution of 0.02M Tris buffer, PH 7.8. Please don't just write numbers.. explain it.
what is the energy of a mole of photons associated with light of frequency 6.65x10^14 Hz? Can you show all steps please.
A second 50ml aliquot was brought to a pH of 10 with an HCN/NaCN buffer, which also served to mask Cd2+; 11.56 ml of EDTA solution were needed to titrate the Pb2+. Calculate the percentage of Pb and Cd in the sample.
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