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the rate at which a substance through a semipermeable membrance is determined by the diffusivity D(cm^2/s)of the gas . D varies the membrance temperature T(K) according to the arrhenius equation D=D0exp(-E/RT) where D0 = the preexponential factor, E=the activiation energy for the diffusion, R=1.987cal/(mol.k) diffusitivities of co2 in a fluorosilicons rubber tube are meauredat several temperature , with the following results: T(K) 347.0 , 374.2, 396.2, 420.7, 447.7, 471.2 D(cm^2/s*10) 1.34, 2.50, 4.55, 8.52, ,14.07,19.99 ( so that D =1.34*10^(-6)cm^2/s) (a) what the are the unites of D0 and E? (b) how should the dara be plotted to obtain line on the rectangular coordinate ? (c) plot thedata in the manner indicated in part (b), and determine D0and E from the resulting line
How many milliliters of boiling water are required to dissolve 25g of phthalic acid? If the solution were cooled to 14oC, how many grams of phthalic acid would you recrystallize out?
anesthetic contains 64.9 % carbon, 13.5 % hydrogen, and 21.6 % oxygen by mass. At 120 degrees C and 750 mmHg, 1.00 L of the gaseous compound weighs 2.30 g.
two naturally occurring isotopes, Re-185 (mass = 184.935 amu) and Re-187 (mass = 186.956 amu). Calculate the percent abundances of the isotopes of rhenium.
How many grams of F2 are needed to produce 157 g of PF3 if the reaction has a 79.8% yield?
Determine what mass of titanium displaces 65.6mL of H 2 O at the temperature 25 degree Celsius if the density of titanium metal is 4.51 g/cm 3 at the temperature of 25 ° C .?
50.0 ml of 2.00M H2SO4 react with 75.O ml of 2.00M NaOH.Identify the limiting and excess reactants.
An aqueous antifreeze solution is 40.0% ethylene glycol, C_2H_6O_2, by mass. The density of the solution is 1.05 g/ml. Calculate the molality of the ethylene glycol.
C6H5NH3Cl is a chloride salt with an acidic cation. If 19 g of C6H5NH3Cl is dissolved in water to make 150 mL of solution, what is the initial molarity of the cation.
Determine the molarity of a saturated NaI Sodium iodide solution (aqueous) formed as twenty five degree Celsius
460. mL of hydrochloric acid (HCl) acid is exactly neutralized with 485 mL 0.660 M NaOH solution. What is the concentration of the acid solution.
Calculate the mass in grams of carbon dioxide that will be produced when 25.0 g of ethanol is burned.
A peat soil was found to have the following Langmuir constants for the adsorption of heavy metals. Using the nonlinear Langmuir equation above, show the equations and plot the nonlinear adsorption isotherms for the three metals
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