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Calculate the molecular mass of PABA, a common sunscreen agent. When 8.32g of PABA is dissolved in 150.0g of chloroform, it boils at 62.62 C. The boiling point of pure chloroform is 61.2 C; the boiling point elevation constant of chloroform is 3.63 C/m
What is the enthalpy change when 1 mole of ammonia gas is decomposed into its elements?
The density of germanium is 5.325 g/cm^3 . If you made a 4 nm quantum dot of germanium, how many atoms would it contain? Assume the dot is spherical.
What observed rotation is expected when a 1.54 M solution of (R)-2-butanol is mixed with an equal volume of a 0.770 M solution of racemic 2-butanol, and the resulting solution is analyzed in a sample container that is 1 dm long
In non-ionic compounds, the two primary sources of intermolecular forces are permanent dipoles and temporary dipoles. Explain what causes each of these types of dipoles to form.
The known metal ion solution used in this experiment contains 0.10 M of each of the six metal ions. What are the initial concentrations of Ag, Pb, and Cl before any precipitation/reaction occurs, but after the mixing (i.e. dilution) of equal volum..
Calculate the osmotic pressure of a solution containing 20.00mg of hemoglobin in 16.3mL of solution at 25 ? C The molar mass of hemoglobin
What is the pH of a saturated solution of Ba(OH)2 at 25oC? For Ba(OH)2, Ksp=5.0x10-3.
Calculate the volumetric size of a water molecule for water in the form of ICE just below the melting point. Give answer in angstroms
if in a certain experiment over a specific time period 0.0027 mol ph3 is consumed in a 1.8-l container each second of
If 750 grams of ammonia and 750 grams of oxygen gas were mixed, what maximum mass of nitrogen monoxide could be produced
Calculate the amount of heat in kilojoules released when 50 grams of steam at 125 degrees C are converted to 50 grams of ice at -125 degrees
Explanation of Ratios, In an unsymmetrical alkene, the boron atom adds predominantly to the least substituted carbon atom. For example, 2-methyl-2-butene gives the products shown below.
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