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The time rate of pressure change in a container sue to the effusion of a gas out of a pinhole in the walls of the container is given by-dp/dt = ubarAp/(4V) ubar= √(8RT/(πM)) where A is the area of the hole, ubar is the average velocity of the gas molecules, and V is the volume of the container. Suppose a one cubic meter container at 300K and one bar pressure containes 80 mol % He and 20 mol % Ar. The container has a pinhole the area of which is one square millimeter. How long will it take for the pressure of the helium to equal the pressure of the argon in the container? When the pressure are equal what will the total pressure in the container be?
Calculate the acitivation energy for the decomposition. b) To test solubility, 0.020 mol of solid lead iodide, PbI2, is added to 0.500 L of water. after eqilibrium has been established 0.00076 mol of Pb^2+ (aq) and 0.00152 mol of I^- (aq) are pres..
The standard cell potential for the electrochemical reaction is 1.10V. Calculate the cell potential if the concentration of zinc ion and copper ion are 0.050M and 5.0M respectively at room temp.
Compare and contrast these methods of extraction- Solid phase extraction, liquid liquid extraction, Supercritical fluid extraction, Derivatization, and solid-phase microextraction
Calculate the heat that must be supplied to 0.104g of Ne(g) at 0.250 atm to raise its temperature from 22.0 degree Celsius to 60.0 degree Celsius at
calculate the specific heat of a substance if a 35 gram sample absorbs 28 joules as the tempature is raised from 292 kelvin to 313 kelvin.
The blood buffer system is made up of H2CO3 and HCO3. Describe with the use of equations how this system responds to added H3O and to added OH.
What percent (by moles) of He is present in a helium-oxygen mixture having a density of 0.518g/L at 25 ?C and 721
Calculate x, the number of molecules of water in oxalic acid hydrate(H2C2O4-xH20), from the following data:5.00 g of the compound is made up of exactly 250 mL solution, and 25.0 mL of this solution requires 15.9 mL of .500M NaOH solution for neutr..
A 50.0 mL sample of vinegar (density = 1.06 g/mL) was diluted to 500.0 mL. Titration of a 50.0 mL aliquot of this solution required 42.5 mL of 0.0900 M NaOH to reach the end point. Determin the acid content of the vinegar as wt. % acetic acid.
Determine the molecular geometry of each of the following molecules
salicylic acid with methanol to yield methyl salicylate why wouldnt you use a strong base like sodium hydroxide?
explain why the chemical formulas AlCl3, PCl3 and CoCl3 are so similar, yet their names are so different.
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