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Calculate the pH of 100. mL of 0.28 M NH3 before and after the addition of 4.5 g of NH4NO3, and account for the change. Assume that the volume remains constant. What is the pH before and after the addition of NH4NO3?
What are the similarities and differences between a classical harmonic oscillator and a quantum harmonic oscillator?
Calcium has a work function of 4.64x10^-19 J. Which of the following wavelenghts will eject electrons from calcium
What is the maximum work you can obtain from 16.0 g of nickel in the following cell when the emf is 0.89 V? Ni(s) | Ni2+(aq) || Ag+(aq) | Ag(s)
The conversion of cyclopropane, an anesthetic, to propylene has a rate constant k - 1.3x10?6 s?1 at 400°C and k = 1.1x10?5 s?1 at 430°C. a) What is the activation energy in kJ mol?1
Calculate the hydrogen-ion concentration [H+] for the aqueous solution in which [OH-] is 1 x 10-11 mol/L. Is this solution acididc, basic, or neutral? Show your work.
radiation with a 58.4 nm of wavelength interacts with a h2hydrogen atomand induces the ejection of an electron then
Find a corresponding criterion for processes at constant V and T. The new thermodynamic variable that is used to express this criterion is called the Helmholtz free energy
how many molecules of ethanol ch2h5oh the alcohol in alcoholic beverages are present in 145ml of ethanol? the density
A sample of gas at 47°C and 1.03 atm occupies a volume of 2.20 L. What volume would this gas occupy at 110.°C and 0.795 atm?
Calculate the amount of heat (in kJ) required to raise the temperature of 242 grams of water from 24 degree C to 65 degree C.
How would you prepare 2-chloro-2-methyloctane in a lab begining with 2-methyl-2-octene and hydrochloric acid? It is reacted over heat with Ch2Cl2.
The half-life of U-235 , an alpha emitter, is 7.1x10^8yr. Calculate the number of alpha particles emitted by 5.1mg of this nuclide in 3.0 minute.
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