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An unknown compound has a formula XF3. If the mass spectra of the molecular ion has only 2 peaks, one of which has a mass of 68 amu and a relative intensity of 100% and a second that has a mass of 67 amu and a relative abundance of 24.2%. Determine the unknown element X and the relative abundance of any isotopes that are evident (F only has 1 isotope)
The t1/2 of a second order reaction is 26.0 hours when the initial concentration of the reactant is 0.256M. How many minutes would it take for the concentration of the reactant to drop from 0.256M to 0.064M
What amount of energy is required to melt a 13.5 g piece of ice at 0oC to form liquid water at the same temperature of 0? The heat of fusion of water = 333 J/g , T he specific heat of H2O is approx. constant at 4.18 J/g x C.
2noo2 makes no2 what mass of no2 is formed when no reacts with 384g o2? how many grams of no are required to react with
16 fl. oz of a certain sample of juice contains the recommended daily allowance 60 mg. given that 1 qt. 0.95 l and
What concentration of sodium formate, NaHCO2, is needed for a buffer solution at a pH of 3.62, if it contains formic acid, HCO2H, with a concentration of 0.150 M.
Which isomer of 1-bromo-3-isopropylcyclohexane reacts faster when refluxed with potassium tert-butoxide, the cis isomer or the trans isomer? Explain your reasoning and draw the structure of the expected product from the faster reacting isomer.
Calculate the pH of a solution made from dissolving 1.00 moles of benzoic acid with 1.00 moles of sodium benzoate in enough water to make 750ml of solution.
A 635 mL sample of unknown solution reacts completely with to form 19.1g CO2 . What was the concentration of the solution?
An aqueous solution of hydrogen peroxide, H2O2 is 30.0% by mass and has a density of 1.11g/mL. What is the molarity of H2O2 (FW 34.02) in this solution
Nitric acid is a strong acid, but nitrous acid is a weak acid. Why? A. there are more electronegative oxygen atoms bonded to the N atom
a quantity of 2.0 102 ml of 0.862 m hcl is mixed with 2.00 102 ml of 0.431 m baoh2. how many moles of water are
Use the Nernst equation to calculate the Cd2+ concentration when given cell potential of +0.768V and Mn2+ concentration of .500M
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