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If a pure R isomer has a specific rotation of -139 degrees, and a sample contains 85% of the R isomer and 15% of its enantiomer, what is the observed specific rotation of the mixture?
Beryllium(II) forms a complex with acetylacetone (166.2g/mol). Calculate the ?molar absorptivity of the complex, given that a 1.34-ppm solution has a transmittance of 55.7% when measured in a 1.00-cm cell at 295 nm, the wavelength of maximum absor..
A solution was prepared by dissolving 620 grams of ethylene glycol, C2H6O2 in 1000 grams of water. Find the concentation of ethylene glycol in molality. Find the freezing point and boiling point of the solution. For water Kf= -1.86 Celsius m-1 and..
Balance each redox reaction occurring in acid aqueous solution. a) I-(aq) + NO2-(aq) ? I2(s) + NO(g)
Gallium crystallizes in a primitive cubic unit cell. The length of an edge of this cube is 362 pm . What is the radius of a gallium atom
Which alkyl halide reacted fastest with silver nitrate in ethanol: tert-butyl bromide or tert-butyl chloride. Explain how the nature of the leaving group affects the rate in the SN1 reaction.
3 tons of ethanol are accidentally discharged into a lake. By how much is the biological oxygen demand of this water increased? Assume that all ethanol is transformed into CO2 and assume the lake contains 108 liters of water.
A 455 g piece of copper tubing is heated to 89 degrees C and place in an insulated vessel containing 159 g of water at 22.8 degrees C. Assume no loss of water and heat capacity for the vessel of 10.0 J/K, what is the final temperature of the syste..
450 L sample of a gaseous compound at 72.5 cm of hg pressure and at 1.00*10^2 has a mass of 1.86 g. what is the molecular weight of the compound
Hydrogen gas will react with oxygen gas to make steam (gaseous water) at 550 K. I mix 5.0 g of hydrogen and 10.0 g of oxygen in a 2 L flask. After equilibrium is established, there is 4.32 g of oxygen remaining. What is the equilibrium constant fo..
.134 mol of KCl and .257 mol of CaCl2 were dissolved in water. calculate the total number of moles of Cl- ions in the solution
calculate how many atoms of potassium a three 3.00 mole sample of k2s would have ?calculate the current for
What single reagent could you add that would allow you to differentiate between the members of each pair of solid compounds below? Tell what happens to each substance when the reagent is added and write a balanced net ionic equation wherever a rea..
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