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Calculate the enthalpies of formation of these isomers. b. What is the difference in enthalpy between these isomers? Maleic acid is the cis-isomer of butenedioic acid, whereas fumaric acid is the
H2AsO4- is amphoteric. What is the balanced chemical equation for its reaction with nitric acid? Write the balanced chemical equation for its reaction with a potassium hydroxide.
Frank and Oswalt report a molar absoptivity of 4700 L mol -1 cm-1 for the thiocyanatoriron(III) ion. What % T would you expect for a solutions that is 1.0x10-4 M in thiocyanatoiron(III) ion, if the
Phosphorus pentachloride decomposes to phosphorus trichloride at high temperatures according to the equation:
You take a 15.00 mL aliquot of a 0.175 M acetic acid solution and a 30.00 mL aliquot of a 0.145 M sodium acetate solution and dilute to 100.00 mL. What is the pH of the resulting buffer?
Use the law of constant composition to complete the following table summarizing the amounts of iron and chlorine produced upon the decomposition of the sample of iron(III) chloride.
Which is more difficult: removing the valence electron from Potassium or removing the valence electron from sodium after the latter has been excited to the 4s level? Why?
What are the differences between alkenes and alkynes? What are the differences between cis- and trans-isomers? How are cistrans isomers used for night vision?
Determine the critical micelle concentration and calculate the area occupied by each adsorbed surfactant molecule at the critical micelle concentration.
What are the acidic pKa values of the respective hydroxyl products? Look up the structures on the internet or use the UF library online e-journals.
For each mole of glycine that burns, 973.49 kJ of heat is liberated. Use this information, plus values of ΔHf° for the products of combustion, to calculate ΔHf° for glycine.
The molarity of 25% ammonium, hydroxide is 13.4 M. Both are sold in 2.5 L bottles. If there were an accident and the two bottles broke and the acid and base mixed, how much heat would evolve?
Write the balanced chemical equation for the reaction in the calorimeter. How many joules were liberated by the reaction?
How does an acidic buffer solution reacts when we add strong acid or base to it? and what are the diffrences in the hydrogen ion concentarion during the process.
How do you safely handle a hot crucible? Does the iron in FeC2O4*2H2O change oxidation number during the heating process? If so, what is the change?
What will the new pressure be when the volume expands to 5.0L and 3.0 mol of helium gas is added while the temperature is constant?
Calculate the change in enthalpy when 52.0g of Cr at 25 degrees celsius and 1 atm pressure is oxidized.
How many grams of silicon tetrafluoride (gas) at room temperature, would fill the same volume as that occupied by 440 grams of carbon dioxide at 290 degrees C and 900 torr?
A sample was placed on a chromatography column. Methylene Chloride was used as the eluting solvent. No seperation of the components in the sample was observed.
Write a balanced equation. Draw the reaction mechanism. Justify the species involved as nucleophiles, electrophiles, radicals, acids or bases.
Calculate how much AgCl is obtained by a precipitating the salt from 10.00 mL of 0.0500 M AgNO3 (aq) by adding an excess of 6 M HCl(aq), then tell why an excess of HCl(aq) is used. Please show all w
A hot air balloon has a volume of 4.00 x 10^5 L at 30 deg. C and pressure of 748 mmHg. If the avg molar mass of air is 29.0 g/mol, what is the mass of the hot air balloon?
Propane gas (C3H8) is used as a fuel in rural areas. How many liters of CO2 are formed at STP by the complete combustion of the propane in a container with a volume of 15.0 L and a pressure of 4.5 at
What partial pressure of hydrogen gas is required in order for 0.00426 g of the gas to dissolve in 20.7 mL of pure water? The Henry's law constant for hydrogen gas is 7.8 x 10 ^-4 M atm^-1.
You are given a small bar of an unknown metal X. You find the density of the metal is 10.5 g/cm^3. Another experiment tells you the edge-length of the face centered cubic unit cell of this metal has