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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 and contrast the accuracy and precision of at least three types of measurements used in life
Conversely, what is the percent H2SO4 in a 6.0M solution of H2SO4? Density of solution = 1.84g/cm^3
What is the pH of a solution that is 0.125 M in methylamine (CH3NH2) and 0.175 M in methylamine chloride (CH3NH3Cl)?
reaction flask and allowedd to come to equilibrium at 250 C: PCL5--> PCl3 +Cl2 if the amount og chlorine in the equilibrium mixture is 0.470mol, calculate (a) the euilibrium concentration of each gas, (b) Kc, (c) the fraction of PCl5 dissociated.
a spherodial bacterium with diameter of 1 um contains twomolecules of a particular protein. what is the molar
the solubility of benzoic acid in water is6.8g100ml at 95 c and 0.3g100ml at 25 c. you are given 10g ofbenzoic acid.
What volume, in mL, of 0.1085 M H2SO4 would react exactly with 40.0 mL of a 0.995 M solution of KOH by the reaction: H2SO4 (aq) + 2 KOH (aq) -------> K2SO4 (aq) + 2H2O (l)
In the Bohr model of the atom, each of these bands corresponds to a transition from a particular quantum orbital energy level to another (n = 1, 2, 3,...). For mercury, which observed color band corresponds to the largest energy difference between..
We will abbreviate malonic acid, CH2(CO2H) 2 as H2M. Find the pH and concentrations of H2M, HM-, and M2- for the following. (Ka values for malonic acid are Ka1 = 1.42 10-3 and Ka2 = 2.01 10-6.)
Assuming the solution has a heat capacity of 4.18 J/°C·g and assuming no heat loss to the calorimeter, calculate the enthalpy change for the dissolution of NH4NO3 in units of kJ/mol.
D=(KBT)/6 xpie xr x n The HIV-1 virus has a radius of about 50 nm. The viscosity coefficient of water at 20 °C is 1.00 mPa·s. How far will a particle of HIV-1 typically travel in 1 minute
If the heat from burning 8.900 g of C6H6 2C6H6(l) + 15O2(g) -> 12CO2(g) + 6H2O(l) + 6542 kJ is added to 5691 g of water at 21 °C, what is the final temperature of the water
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