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Polyaromatic hydrocarbons are usually associated with soot particles, as adsorbates on the surace. Compute the relative and actual surface areas actual values in m2 g-1 of soot particles p= 0.6 g mL-1 having diameters 20 microliters and 2 microliters, respectively presuming that the prrticles are speres. Speculate on the health implications with regard to human intake of PAH compounds.
PbCl_4_ solution reacts with 20.0 mL of (NH_4)_SO_4_, what is the molarity of the (NH_4)_SO_4_?
During a typical breathing cycle the CO2 concentration in the expired air rises to a peak of 4.6% by volume.
Define why the benzene ring is more reactive towards electrophilic aromatic substitutions and why the electrophile will predominately go to the ortho as well as para positions.
What ions will you find in solution. You want to separate the calcium from iron by addition of Na3PO4. The Ksp for Ca3(PO4)2 (s) is 1.3x10-32 and that for FePO4(s) is 1.0 x 10-22. Identify the precipitate that forms first. Is the separation succes..
Explain why alcl3 has a molar heat capacity that is approximately 4 times the molar heat capacity of a metallic crystal.
Compute the pH at the equivalence point for the titration of 0.20M HCl versus 0.20M NH3.For NH3, Kb=1.8x10
How many liters of hydrogen gas are collected over water at 18 degrees Celsius and 725 mmHg when 0.84 g of lithium reacts with water?
Consider a titration of 24.2 mL of 0.0878M solution of aqueous ammonia [Kb(NH3) = 1.8e-5] with a 0.115M of hydrochloric acid.
What mass of silver was in the original solution? (Assume that all of the silver was precipitated out of solution by the reaction.)
The half-life of C-14 is 5730 years. A bone sample with 3.6 g of carbon has 32.6 disintegrations per minute. How old is the bone sample in years?
Aluminum has a density of 2.99 grams per cubic cm. and a specific heat of 0.22 calories per gram degree Celsius. A cube of aluminum is sitting out in the sun where it absorbs 16.2 calories of heat and warms from 62*F to 149*F How many inches wide ..
How many cells are on the plate. What fraction of the cell surface is occupied by receptors versus normal phospholipids
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