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Compare the rates of effusion for oxygen molecules as compared to hydroge molecules. which will effuse faster, and by how much?
A manufacturer of bicycles has 4819 wheels, 2305 frames, and 2250 handlebars. How many wheels are left over? How many frames are left over? How many handlebars are left over? Which part limits the
If you prepare a 1.00 solution of beginning with water at 27.5, what is the final temperature of the solution (in )? Assume that the specific heats of both pure and the solution are the same, 4.18
What is the pH at the half stoichiometric point, if you are doing a titration with 20.0 mL of 0.200 M trimethylamine and with 0.100M hydrochloric acid? pkb=4.19
A chemist dissolves 0.099g of CuSO4 · 5 H2O in water and dilutes the solution to the mark in a 500-mL volumetric flask. A 8.7-mL sample of this solution is then transferred to a second 500-m
What is the composition of vapor of a pentane-hexane solution that has a vapor pressure of 373 torr at 25 degree celcius? Given is Pure Hexanes and pentanes vapor pressure at 25 degrees celcius. Pen
Prepare a standard of lidocaine in methanol with a final concentration of 1.00 mg/mL using the powder lidocaine/HCl. Show the calculations and explain how you take the salt form into account.
An FM station broadcasts at 106.9 MHz, calculate the wavelength of the corresponding radio waves? What is the amount of energy packaged in a photon with a wavelength of 310 nanometer and calculate
A sample of helium effuses through a porous container 6.5 times faster than does unknown gas X? what is the molar mass of the unknown gas?
Solution A: Hydrogen peroxide usually comes commercially as a 30% (w/w) aqueous solution, with a density of 1.106 g/mL. Calculate the volume of the 30% solution one would need to make 50. mL of 4.0 M
What may happen to a large (i.e., 30-50lb) container of trichloro-s-triazinetrione, or calcium hypochlorite, if it is left to sit in the water and muck remaining in a building after fire fighting e
Calculate the bicarbonate and carbonate alkalinities, in mg/L as CaCO3 , of a water having a total alkalinity of 233.0mg/L as CaCO3 and a ph of 10.47?
A 27.0-gram sample of an unknown hydrocarbon was burned in excess oxygen to form 88.0 grams of carbon dioxide and 27.0 grams of water. What is a possible molecular formula of the hydrocarbon?
calculate the molecular mass of a solute with 8.02 grams of solute in 861 grams of water lower the freezing point to -.430 degree Celsius.
Calculate the minimum volume in litres of aqueous sodium hypochlorite solution 12.5%, 12.5g/100ml that would be needed to convert all of the cyanide residues in a gold mine's oxidation pond into the s
When the bag was removed, the ice had melted and the liquid water had a temperature of 17.0 deg C. How many kilojoules of heat were absorbed?
A solution was prepared by mixing 50.00 mL of 0.190 M HNO3 and 124.00 mL of 0.150 M HNO3. Calculate the molarity of the final solution of nitric acid.
Calculate the number of grams of aluminum required to prepare 500.0g of chromium metal.
There are 2.2 mg of lead in exactly 500 g of a water sample. What would the concentration of lead be in parts per million?
When formic acid is heated it decomposes to hydrogen and carbon dioxide in a first order decay calculate the partial pressure of formic acid if the intial pressure at time 0 equal 220 torr
The Temperature of the gas was 291.2799 K before expansion and 293.9809 K afterwards. What is the change in Enthalpy with respect to pressure at constant temperature,(δH/δp)T for this ga
What would happen to the average kinetic energy of the molecules of a gas sample if the temperature of the sample increased from 20 degrees celcius to 40 degrees celcius.
What is the major product of the reaction between methanol and (2R,3S)-2-bromo-3-methylpentane at room temperature
Write the full electronic configuration for Sr, He, Zn, Br and for each of the following elements indicate which set of orbitals is being filled last (# of sublevel & s,p,d,f) for chemical symb
An aqueous solution that contains 285ppm of potassium nitrate (KNO3) is being used to feed plants in a garden. What volume of this solution is needed to prepare 1.7 L of a solution that is 97 ppm in