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The question states: The distribution coefficient for caffeinein dichloromethane and water is 4.6. Assume that your 100 mL teasolution contained 0.30 g. of caffeine.
An unknown hydrocarbon A, with formula C6H12, reacts with 1 molar equivalent of H2 over palladiumcatalyst. Hydrocarbon A also reacts with OsO4 to give a diol, B.
Sodium nitrate was added to 2.0 L of water at 25 °C to produce a saturated solution. The solution was then heated to 80 °C. Calculate the mass of lead nitrate that had to be added to produce
When given a molecule, how do you draw the Fisher projection? How do you know which atoms (or groups) should go back and come out?
A student uses a balance to determine the mass of an object as 12.28 grams. The correct mass of the object is 12.45 grams. What is percent error in the student's mass determination?
How many grams of PBr5 is formed from 31.0 grams of phosphorus and 154 mL of bromine? Density of Br2 = 3.12 g/ ml? How many grams of the excess reactant will be left over?"
Fructose, C6H12O6, is a naturally occuring sugar found in honey and many fruit juices. Its molar mass is 180.16 g/mol. A 1.60M solution of fructose in water has a density of 1.109 g/mL at 20degrees
How many grams of sodium chloride would you need to add towater (bringing the total volume of the solution to 1 liter) tomake a 0.14 molar solution?
The US consumed 48 EJ of petroleum in 2000. How many squaremeters of PV collectors would be needed to supply the equivalent amount of energy in hydrogen?
A water scientist determined the concentrations of calcium and magnesium ions in a sample by titration with 0.06500 M EDTA. Two 50.00-mL portions were taken. The first titration was carried out at p
For SOCl2, from step 3 to step 4 how do we know when toadd in another bond to form a double bond between the O and Satoms?
What mass of sodium chloride would need to be added to the blood to bring the sodium ion concentration up to 0.137 M, assuming no change in blood volume?
The following experiment was carried out with a newly made gaseouschlorofluoro carbon. 50.0 ml of the gas effused through a barrier in157 secs. the same volume of argon effused through the barrier i
If 27.5 mL of a 0.1 M NaOH solution is needed to neutralize 50.0 mLof an HCl solution, what was the initial molarity of the HCl solution?
A 0.0450 M solution of para-aminobenzoic acid had an absorbance of 0.844 at 267 nm in a 1.00 cm cuvet, and an absorbance of 0.034 at 240 nm. A 0.0366 M solution of nicotinic acid had absorbances of
Calculate the energy change (in J) associated with an electron transition from the n = 3 to n = 2 in a bohr hydrogenatom. What is the wavelength of the light emitted?
Element X crystallizes in a body-centered cubic lattice. Its atomic mass is 59 amu. The edge length of a unit cell of X is 0.28A.Calculate the radius of an X atom and the density of X ing/cm3.
A 0.1375 -g sample of solid magnesium is burned in a constant -volume bomb calorimeter that has a heat capicity of 3024 J/C. the temp increases by 1.126 C . Calculate the heat given off by the burni
A metal has a threshold frequency of 7.5x10^14 hz. Determine the wavelength (m) of the electron emitted from the metal exposed tolight of wave length 206 nm.
Assume that a flat plate PV system is used, with asolarconversion efficiency of 25 percent and a hydrogenproduction efficiency of 60 percent.
What does it mean to say that a solution is saturated with a solute? (Select all that apply.) A saturated solution is one that is at equilibrium with undissolved solute. A solute without any bonding
Ammomia burns in oxygen gas to form nitric oxide (NO) and water vapor. How many volumes of NO are obtained from one volume of ammonia at the same temp and pressure?
If 7.25 mL of .100 M NaOH titrant is used to backtitrate the excess .100 M HCl from the analysis of one-third of aMaalox tablet, how many milliliters of .100 M HCl have beeninitially added to the 20
Assuming the volume of the stomach to be 1.0L, what will be the pH change of the stomach acid resulting from the ingestion of one Regular Strength Maalox tablet?
How many grams of Mg(OH)2 will be needed to neutralize 25 mL ofstomach acid if stomach acid is 0.10 M HCl ? How many mL of a 0.10 M NaOH solution are needed to neutralize15 mL of 0.20 M H3PO4 solution