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A gas sampling device containing 200g of the sorbent Tenax is used to collect organic impurities from air that may be contaminated with 1,1,2-trichloro-1,2,2-trifluoroethane. At the end of sampling, 240 L of air had been drawn through the sampling system, and the concentration of the chlorofluorocarbon in the Tenax was 811 mg/kg. Assuming 100% trapping efficiency because no weight gain was observed in a second Tenax tube placed in series after the first, what was the contaminant concentration in the air in ppm? The ambient temperature was 18 degrees C and pressure was 750 mm Hg.
Compare the rate of effusion of NH3 with that of N2 at the same temperature and pressure. Compare the time required for equal numbers of moles of N2 and NH3 to effuse
At 22 degrees celsius the vapor pressure of pure acetone, C3H6O is 189.2 torr and of pure diethyl ether C4H10O is 451.8 torr. calculate the mole fraction of acetone
charcoal is primarily carbon. determine the mass of CO2 produced by burning enough carbon to produce 5.00 X 10^2 KJ of heat.
if the sun is a distance of 1.5 x 108 km from earth how many minutes does it take sunlight to reach earth if light
To a .015 M solution of Oxalic acid is added a strong acid until pH is .5. Calculate concentration of oxalate ion in resulting solution no volume change Ka oxalic acid is 3.78 x 10-6
calcium chloride cacl2 is added to 3.0 l of 0.050 m k2so4 until a precipitate forms. how many grams of cacl2 were
A drop of NaOH titrant adheres to the side of the buret between the initial and final readings for the titration.As a result of the `clean glass`error, will the molar concentration of the NaOH solution be reported as too high or too low
kilimanjaro in tanzania is the tallest peak in africa 19340 ft.. on a particular day the barometric pressure at the top
calculate the mass of vapour present in a room of volume 250 meter cube that contains air at a temperature of 23
How many milliliters of O2 measured at 24C and 757mmHg , are released from solution in the first minute of the reaction? Please find volume
calcualte the pH at one-half the equivalence pont and at the equivalence point for a titration of 50 mL of 0.100M acetic acid with 0.100M NaOH
What volume of glacial acetic acid (18 M) and what weight of sodium acetate trihydrate (CH3COONa•3H2O) are required to make 100 mL of 0.2 M buffer at pH 4.50 (pKa of acetic acid is 4.74)
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