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What is the molar mass of an unknown molecular compound is 3.42grams dissolved in 41.8 grams benzene begins to freeze at 1.17degree's C?
What is the freezing point of a solution containing 3.10 gramsbenzene (molar mass = 78.11 g/mol) dissolved in 32.0 grams paradichloro benzene?
The thermal decomposition of N2O5 obeys first order kinetics.At 273K, a plot of ln[N2O5] vs. t gives a slope of -5.34 x10^-3 min^-1. What is the half life of the reaction?
Calculate the formal concentration of a sodium acetate solution prepared by diluting 45.0 mL of a solution containing 10.8 ppm sodium acetate(NaC2H3O2) to a total of 0.500liters of solution.
Phenol C6H50H is a weakorganic acid. Suppose 0.515g of the compound is dissovled in exactly 125mL of water. The resulting solution is titrated with 0.123 M NaOH.
In the nitration of methyl benzoate, why do you wash the crystals with water followed by an ice-cold methanol washing? What is the purpose of pouring the reaction mixture overice?
Cloudiness in ice cubes is caused by dissolved air in the water asit freezes. To make ice sculptures that are beautifully clear,artists sometimes make ice blocks out of the water that has been boile
The reaction A + B --> P at temperature 25°C is the second order reaction with the rate constant k. The initial concentrationsof A and B are [A]0 = 2.0 M and [B]0 = 3.0 M.The rate of the reac
Rates of reactions can be determined by monitoring the change in concentration of either reactants or products as a function of time. Is there reaction even if the concentrations do not change? Wh
When 2-phenyl-2-butene was treated with H2SO4 and H2O, a compound with molecular formula C20H24 was isolated as a side product. Suggest a structure for this compound and provide a mechanism to expla
Ethylenediamine is a bidentale ligand. If the coordination number of a metal is 6 how many ethylenediiamine molecules will bind to the metal complex?
Instant cold packs used to treat athletic injuries contain solid NH4NO3 and a pouch of water. When pack is squeezed the pouch breaks and the solid dissolves, lowering the temperature. NH
A 5.00-mL aliquot of a solution that contains 2.79 ppmFe2+ is treated with an appropriate excess of thiocyanate and diluted to 50.0 mL. The molar absorptivity of a Fe2+-thiocyanate solution at 580 n
Starting with ethyl ethanoate, show thestep-by-step mechanism for the base-promoted hydrolysis of theester to form the alcohol and carboxylate salt of the acid.Indicate intermediates that may or may
An atom has double-fold degenerate ground level , a non-degenerate electronically excited level at 3500 cm-1 and a three-fold degenerate level at 5300 cm-1 .
Suppose you had a sample containing 75.0% by weight potassium chlorate and 25.0 % inert, non-volatile material. What weight loss whould you observe after intense heating, if the original
Sappose that 25.0 mL of 0.50 M K2CrO4(aq)reacts with 15.0 mL of AgNO3(aq) completly.What mass ofNaCl is needed to react with 35.0 mL of the same AgNO3solution?
Pure Ag melts at 961.8 degreesC and boils at 2162 degreesC.The heat of fusion for Ag is 11.28kJ/mol and the heat ofvaporization is 250.6kJ/mol.
A 19 mL sample of a solution of Li2S was diluted with water to 76 mL. A 25mL sample of the dilute solution was found to contain 1 MLi+. What was the concentration of Li2S in the original undiluted sol
A rechargeable battery is constructed based on a concentrationcell constructed of two Ag/Ag+ half-cells. The volume of eachhalf-cell is 2.0 L and the concentrations of Ag+ in the half-cells are 1.35
Hydrochloric acid is usually purchased in a concentration form that is 37.0% HCl by mass and a density of 1.20 g/mL. What volume ofconcentrated HCl is required to prepare 2.0L of 0.500 M HCl?
Water softeners often replace calcium ions with in hard water with sodium ions. However, the FDA recommends that adults ingest lessthen 2.5g of sodium per day.
The Ksp of the phosphate fertilizer CaHPO4. 2H2O is 2.7 x 10-7 at 25oC.what is the molar concentration of a saturated solution? What mass of this compound will dissolve in 3.0 L of water at thi
Use the pKa values to predict which functional groups in the amino acids aspartic acid and phenylalanine are expected to be protonated int he presence of acetic acid.
If the pressure exerted by ozone, O3, in the upper stratosphere is 2.28 torr of Hg and the temp is 250k, how many molecules of ozoneare in one liter? (1 mole of any gas contains 6.022 x 10^23molecul