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13. Calculate the mole fraction ( Xethanol) of C2H5OH in a solution that contains 46 grams of ethanol, C2H5OH, and 64 grams of methanol, CH3OH.
14. Calculate the molarity (M) of a solution made by dissolving 360 g of glucose (C6H12O6) in enough water to make 1.5 L of solution.
15. Describe how you would prepare 500 mLs of a 6.0 M HNO3 solution from an 18 M HNO3 solution.
A solution is labeled "0.464 M NaClO." What are the following in the solution? Express your concentrations to three significant figures even when only two are valid. Express your pH to two places past the decimal point. Note that the value of Ka f..
If the initial surface coverage is 8.9*10^16 molecules/cm^2, how long will it take for one-half of the film to evaporate? b. What fraction of the film is left after 10 s? Assume the same initial coverage as in part a.
a sample of vanadium haveing 5.67 grams of mass upon heating combined with oxegen of 4.45gramsto make vanadium oxide.
What is the molecular weight of a gas if a 250 mL sample of this gas collected over water at 735 mm Hg and 28.0°C has a mass of 1.25 gram? The equilibrium vapor pressure of water at 28.0°C is 28.3 mm Hg.
All numerical answers must be reported to the correct number of significant figures. In a routine laboratory analysis, a technician prepare a solution containing 0.126 g of KMnO4 in a 0.250 L volumetric flask. What is the molar concentration (mola..
Why is it important to recrystallize the chalcone before proceeding with the hydrogenation reactions?
The half-life of plutonium-239 is 24,100 years. How long will it take for a 100 g sample of plutonium to be reduced to 25 g
What are the relative percentages of hydrogen cyanide (HCN) and cyanide ion in a dilute aqueous solution
In this Case assignment, you will determine the spectroscopy of unknowns at:
Calculate the aqueous solution with the highest freezing point. These are all solutions of nonvolatile solutes and you should assume ideal Van't Hoff factors where applicable
If the energy needed to raise the temperature of the water to 28.1 C is obtained from the combustion of methane (CH4), what volume of methane, measured at STP must be burned
the specific rotation of r--glyceraldehyde is 8.7. if the observed specific rotation of a mixture of r-glyceraldehyde
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