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A mole of atoms, ions, molecules, or anything else contains Avogadro's number, 6.022 x 1023, of these units. A mole of ascorbic acid (vitamin C), C6H8O6, has a mass of 176.0 g. If you ingest a vitamin C tablet containing 4.5 x 1022 carbon atoms, what was the mass, in milligrams, of the tablet, assuming that the tablet is 100% pure?
dissolved in 200 mL of solution. What is the pH of the solution? pKa1 = 6.37 and pKa2 = 10.25.
what mass of water must be used to dissolve 20.0 grams of ethanol, C2H5OH, to prepar a 0.0500 molal solution of ethanol
A 0.160-mole quantity of NiCl2 is added to a liter of 1.20 M NH3 solution. What is the concentration of Ni2 ions at equilibrium. Assume the formation constant* of Ni(NH3)62 is 5.5 × 108.
Calculate the hypothetical retention times for caffine and aspartame if their retention factors were reduced by 28.0 %. Assume the mobile phase retention time (tm= 29.7 s) remains constant.
Three and one - third mol es of Cl2 (g) are now added , keeping P and T constant. Calculate the number of moles of Cl2 present when equilibrium is reestablished. Obtain also the ratio of the final to the original total volume.
Determine the configuration (in the form t2g x egy or ext2y, as appropriate), the number of unpaired electrons, and the ligand-field stabilization energy in terms
For the reaction N2O4(g) (equilibrium arrows) 2NO2(g), kp = 0.25 at a certain temperature. Calculate the equilibrium pressures of NO2(g) and N2SO4(g) if the initial pressures of the components when placed in an otherwise empty container are as f..
Use the appendices in your textbook to estimate the normal boiling point of water at 1 atm. Compare the temperature obtained with the known boiling point of water. Can you explain the discrepancy. At what temperature does water boil
given a list of the natural sciences, including mathematics, physics, chemistry, nbiochemistry, biology, ecology, where does one science end and another one begin?
A concentration of the pollutant NO2 in air of 3.00 ppm (m/v) may be lethal to humans. Will air that contains 1.9 x 10^-3g at NO2 per liter be lethal to humans?
a light woman and a heavy man jump from an airplance at the same time and open their same-size parachutes at the same time. which person will get to a state of zero accerlation first?
Calculate the vapor pressure of a solution of 20 g of benzene (C6H6) and 20 g of toluene (C7H8) at 90 oC. Is the boiling point of this mixture higher or lower than 90 oC at an atmospheric
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