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When 0.186g of an organic substance of unknown molar mass is dissolved in 22.01 g of liquid camphor, the freezing point of the mixture is 176.7 C What is the molar mass of the solute?
Why is it important to use a large excess of sodium borohydride when doing a reduction in aqueous ethanol ? ( hint consider what reaction might occur between water and sodium borohydrid
When concentrated H2SO4(l) is added to KI(aq), I2(s) andH2S(g) are formed. When the equation for this reaction is balanced, what is the number of electrons transferred?
How much energery is needed to raise the temperature of a silver necklace chain with a mass of 22.5g for room temperature, 25degrees C, to body temperature, 37 degrees C?
A 79.9 cm ^3 sample of oxygen is collected by water displacement at 24 degrees C. What volume would the gas occupy at standard pressure if the gas is collected originally at a pressure of 98.5
Once the chromatographic column has been prepared , why is it important to allow the level of the liquid in the column to drop to the level of the alumina before applying the solution of the compoun
At 298K, S2F4(g) partially decomposes to SF2 (g). at equilibirum the partial pressure of SF2(g) is 8.4x10-2torr and the partial pressure of S2F4(g) is 36.8 torr.
Combustion of 3.50g of ethanol, C2H5OH (l) ina calorimeter with a heat capacity of 15.2kJ/°C causes a temperature increase from 19.88°C to 26.18°C. Find the molar enthalpy of combustion
Chloromethane, CH3Cl, arises from the oceans and from microbial fermentation and is found throughout the environment. Itis used in the manufacture of various chemicals and has been usedas a topical
Benzoic acid is a white, crystalline powder used as a food preservative. It consists of carbon, hydrogen, and oxygen. If 0.0500 grams of the compound are burned in excess O2 ,0.126 grams CO2&nb
A 24 hour urine specimen was diluted to 2L \after the solution was buffered to pH10 a 10 ml aliquot was titrated with 27.32 ml of0.003969M EDTA The Calcium in the second aliquot was isolated asCaC2O
A saturated solution of potassium chlorate is dissolved in 100 gof water. If the saturated solution is cooled from90°C to 60°C, how many grams of precipitate will be formed?explain.
A solution containing Pt4+ is electrolyzed with acurrent of 3.60 A. How many minutes will it take to plate out 89.0 percent of the platinum in 0.550 L of a 0.0150 M solution of Pt4+?
An unknown concentration of a solution gave a Percent Transmittance of 68% under Spectronic 20 passing through 8mm path length. Calculate its concentration given that the molar absorbtivity of the s
A buffer system, that is important for humans, is formed between carbonic acid and the bicarbonate ion. Calculate the molar ratio of bicarbonate ion to carbonic acid present at pH 7.56. (Ka = 4
When determining pH of atitration (weak acid strong base) using equilibrium constants, what purpose does hydrolysis serve and how is the pH determined usingit?
Determine the average mass of an ice cube produced by an ordinary refrigerator standard ice cube maker.Statethe type and model of refrigerator.Provide any necessary detailed about the ice cube maker
A solution is prepared by dissolving 0.17mol of acetic acid and 0.17 mol of ammonium chloride in enoughwater to make a 1.0 L of solution. Find the concentration of ammonia in the solution
Calculate pH at the equivalence point in a titration between 10.0 mL acetic acid (0.1000M) and sodium hydroxide (0.1000M)
You need to prepare 600 mL of a 2.00 M NaOH solution from a10.0 M NaOH solution. What is the volume of the NaOH solution do you use?
Hydrogen sulfide can be prepared in the laboratory be reacting iron (II) sulphide with dilute hydrochloric acid: 80.0 g. of FeS is reacted with 250.0 ml of 0.80 M HCl. How many liters of H2S can be
Calulate the molar solubility of a saturated solution of Ag2SO4 if the Ksp =1.2 x10-5. Write the equilibrium equation and equilibrium expression.
It has been stated that ten half-lives are sufficient for a radioactive isotope sample to decay to backround levels. What fraction of the initial amount of an isotope actually does remain after ten
Their molar entropies are in teh sequence H2O <Hg< Br2.Using molecular properties, explain why bromine is more disordered than mercury but water is the most highly order of these thress.
Show how the transformation of cyclohexanecarboxamide to cyclohexylethyl ketone may be accomplish using a nitrile as anintermediate .