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Explain if the standard enthalpy of formation of ammonia vapor at 298K is -46.11kJ/mol. Determine its standard enthalpy of formation at 360K, specified that the molar heat capacities of the reactants as well as products are given by: Cpm = a + bT + c/T^2.
the R enantiomer and 19.0% of the S enantiomer, what is the enantiomeric excess of the mixture?
Calculate the heat released when 2.00 L of Cl2(g) with a density of 1.88g/L react with an excess of sodium metal at 25oC and 1 atm to form sodium chloride.
Give the full electron configuration (# electrons, quantum numbers for last electron added, orbital diagram, electron configuration) for each of the following
If cost per gram were not a concern, which of the following substances would be the most efficient per unit mass for melting snow from sidewalks and roads. Explain.
Firefly luciferase is the enzyme that allows fireflies to illuminate their abdomens. Because this light generation is an ATP-requiring reaction, firefly luciferase can be used to test for the presence of ATP.
What is the concentration of CO3^2- in a 0.020 M solution of carbonic acid, H2CO3? For a carbonic acid, Ka1 = 4.2 x 10^-7 and Ka2 = 4.8 x 10^-11.
Amphetamine (C9H13N) is a weak base with a pKb of 4.2. Compute the pH of a solution containing an amphetamine concentration of 219 mg/L.
Consider an unknown that is approximately 50.% KHP. What mass of the unknown would be required to react with 40. mL of 0.10 M NaOH?
Calculate the pH of a buffer made with 0.50M phosphoric acid and 0.75M sodium dihydrogenphosphate. Ka = 7.5 x 10-3.
43.8 ml of 0.170 M HCl is needed to neutralize 37.6 ml of Ba(OH)2 solution. What is the molarity of the base. 2 HCl + Ba(OH)2 =BaCl2 +H20
Oxygen gas, generated by the reaction 2KClO3(s) ? 2KCl(s) + 3O2(g), is collected over water at 27°C in a 3.78-L vessel at a total pressure of 730. torr. (The vapor pressure of H2O at 27°C is 26.0 torr.) How many moles of KClO3 were consumed in the..
how do the properties of iron alone compare with the iron in an unheated iron-sulfur
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