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A 0.45 M solution of pentanoic acid (CH3CH2CH2CH2COOH) is found tohave a pH of 3.73 at 298K. What is the value of the acid dissociation constant Ka for this monoprotic acid?
For a one step reaction, the activation energy for the forward reactio is +40.0 kJ / mol and the enthalpy of reaction (ΔH) is +20 kJ/mol. What is the activation energy for the reverse reaction
In the Haber process, at 450°C, has an equilibrium constantK = 0.30. What is the equilibrium concentration of hydrogen in a system containing the following equilibrium concentrations of nit
The specific heat capacity of liquid water is 4.18 J/g-K. How many joules of heat are needed to raise the temperature of 5.00 g of water from 25.1°C to 65.3°C?
What reagent solution would you use to separate the cations in the following pairs, that is, with one cation appearing in solution and other in precipitate?
A standardized KMnO4 solution can be used to analyse compounds of unknown composition. One such compound is hydrated calcium oxalate, CaC2O4 xH2O.
The decomposition of dimethyl ether, (CH3)2O(g) -> CH4(g) + H2(g) + CO(g), is first-order with a half-life of 1733 s at 500oC. In an experiment at this temperature, if [(CH3)2O
When 3.56 g of an unknown hydrocarbon was dissolved in 125 g of benzene, the freezing point of the solution was found to be 4.41oC. Analysis of the hydrocarbon showed that it contained 93.71% carbon (
When is extraction an appropriate technique for separation (ex: is there an ideal sample size range, is there a minimum starting purity, what final purity should be expected, etc.)?
In the titration of an impure sample of KHP, it was found that 30.6 mL of 0.100 M NaOH was required to react completely with 0.745 g of sample. What is the percentage of the KHP in this sample?
Calculate the frequency of a photon emitted when an electronof a hydrogen atom drops from energy level n=5 to n=3.
If 1 kg of hydrogen is completely burnt in oxygen and the heat released is used to convert water to steam, how much mass of water can be converted to steam?
A 33 g ice cube at its melting point isdropped into an insulated container of liquid nitrogen. How much nitrogen evaporates if it is at its boiling point of 77 K and has alatent heat of vaporization
According to the VSEPR theory, what should be the shapearound each carbon atom, in a molecule of cubane? What bond anglesare associated with that shape?
Trichloroacetic acid (CCl3CO2H) is acorrosive acid that is used to precipitate proteins. The pH of a0.050 M solution of trichloroacetic acid is the same asthe pH of a 0.040 M HClO4
Compound A (C9H12) absorbed 3 equivalents ofH2 on catalytic reduction over a palladium catalyst to give B (C9H18). On ozonolysis, compoundA gave among other things, a ketone described ascyclohexa
Write the balanced equation for the thermal decomposition of sodium Hydrogen carbonate. what is the molar masses of sodium hydrogen carbonate of each of the product of thermal decomposition.
Calculate the potential of the cell that will be formed by combining the titanium half-cell with a nickel half-cell, understandard conditions
A water contains contains 2.0 meq/LCa2+ and 1.3 meg/L Mg2+. If one wanted to remove the hardness species by hydroxide precipitation, to what pH must the water be raised and maintained in order for
The normal melting point ofcyclohexane is 7.0°C. The 3 phases of cyclohexane co-existin dynamic equilibrium at 24.0 torr and 3.8°C. At287.0°C gaseous cyclohexane can be compressed to a l
Give the reaction scheme, showing the products formed (before hydrolysis), when one equivalent of ethyl magnesium bromide is treated with one equivalent of 5-hydroxy-2-pentanone.
Eugenol has a boiling point of 255 degrees Celsius. How is it possible to distill it with water at a temperature slighly below100 degrees Celsius? In other words, explain briefly the theory of steam
How does a catalyst affect the rate of a chemical reaction? Provide a sketch of a potential energy diagram showing how a catalyst affects the rate of a chemical reaction. Label appropriately.
The rate constants of some reactions double with every 10 degree rise in temperature. Assume that a reaction takes place at 305 K and 315 K. What must the activation energy be for the rate constant