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The human body contains 63% H, 25.5% O, 9.45% C, 1.35% N, 0.31% Ca, and 0.22% P, plus several elements present in smaller quantities. Are these mass or mole percents? About how many pounds and pound-moles of each element is carried around in a 155 pound person?
What is the mole fraction of pentane in a pentane-hexane solution that has a vapour pressure of 308 torr at 25 oC? (At 25 oC the vapour pressure of pure pentane is 511 torr and that of hexane is 150 torr.)
how many liters of CO2 gas can form at STP when 15.5 mL of a 3.00 M HCl solution reacts with excess CaCO3? c)what is the molarity of a HCl solution if the reaction of 200 mL of the HCl solution with excess CaCO3 produces 12.0 L of CO2 gas at 725 m..
The concentration of Mg2+ in seawater is 0.052 M. At what pH will 74% of the Mg2+ be precipitated as the hydroxide salt? [Ksp for Mg(OH)2 = 8.9* 10-12.]
Oxalic acid dihydrate is often used as primary standard for the standardiztion of base solutions. For a procedure comparable to this experiment, approximately how many grams of oxalic acid dihydrate should be used in order to have a volume of abou..
The mass of an atom of beryllium is 1.5 x 10^-26 kg. How many beryllium atoms are present in beryllium film of mass 0.37 g used as a window on an x-ray tube
What fraction of the O3 will have reacted when the rate falls to one-half of its initial value?
how many milliliters of .1229 M NaOH are needed to completely neutralize 50.00mL of .1012M H2SO4 solution
What is the ph of a solution that results from diluting .30 mol acetic acid and .20 mol sodium acetate with water to a volume
solution of potassium permanganate has a percent transmittance of 27.3% when measured in a 1.15-cm cell at a wavelength of 525 nm. Calculate the absorbance of this solution.
Identify the Lewis acid and Lewis base that lead to the formation of the following species: (a) AlCl4-, (b) Cd(CN)4 2-, (c) HCO3-, (d) H2SO4
Aminotransferases are enzymes that catalyze the interconversion of amino acids and ?-keto acids. In this way, they can provide the carbon needed for gluconeogenesis from amino acids supplied by dietary protein
A smple of mixture of NaCl, Caco3 and SiO2 weighed 7.30 grams. During the water wash the sample lost 2.21 grams. After treatment with HCL, the sample weighed 2.05 grams.
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