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Calculate the energy needed to convert 50.0 g methane (CH4) from a solid at --100.°C to a liquid at 25°C.
How many milliliters of 1.00 M KOH should be added to 100 mL of solution containing 10.0 g of histidine hydrochloride (His HCl, FM 191.62) to get a pH of 9.30?
A sample of granite contains various oxides of silicon, aluminum, sodium, potassium, calcium, and iron. Each of these oxides gives the granite a coarse-grained texture. Which term or terms could be used to describe this sample of granite?
Which of the following nuclides have magic numbers of both protons and neutrons: (a) helium-4, (b) oxygen-18, (c) calcium-40, (d) zinc-66, (e) lead-208
The reaction between N2 and H2 to produce NH3 is an important industrial process. Using the information from your text and handouts (you may assume ideal gasses) calculate the equilibrium constant for this reaction at 400 ºC
Ni(s) +4CO(g) Ni(CO)4(g) Given that the standard free energies of formation of CO9g) and Ni(CO)4 are -137.3 kj/mol and -587.4 Kj/mol, respectively, calculate the equilibrium constant of the reaction at 80C. Assume that DeltaGf is temperature ind..
the addition of a crystal of sodium chlorate to a sodium chlorate solution causes additional crystals of sodium chlorate to precipitate. the orginal solution was what
The IR Spectra of solid benoic acid and liquid acetic acid are shown below. The OH stretch of a carboxylic acid is normally a broad peak from 3500-2500 cm-1. Explain why acetic acid has a very broad intense and prominent peak in this area but benz..
using a solution of kmno4 has a percent transmittance of 27.3 percent when observed in a 1.15-cm cell at a wavelength
Calculate the pH of the solution after 52.00 mL of HNO3 is added. What is the: 1) moles of KOH: 2) moles of HNO3: 3) [H3O]+: 4) pH of the solution
A graduated cylinder contains 148 of water. A 17.0 piece of iron (density = 7.86 ) and a 19.0 piece of lead are added. What is the new water level in the cylinder?
Explain why selectivity in isocratic HPLC system ideally should not depend on eluent composition. (Use thermodynamic derivation to support your explanation).
What volume of fuel should you bring? Assume each of the following: the fuel has an average formula of 15 of the heat generated from combustion goes to heat the water (the rest is lost to the surroundings)
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