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Question- A 8.00mL ampule of a 0.120M solution of naphthalene in hexane is excited with a flash of light. The naphthalene emits 15.2J of energy at an average wavelength of 349 nm.
What percentage of the naphthalene molecules emitted a photon?
I have no idea how to do this! Thank you for your help
What is the empirical formula of the compound?
A buffer was formed by mixing 50.0 mL of 0.206M NH4Cl(aq) with 45.0 mL of 0.222M NH3(aq) {Kb (NH3) = 1.8 x10-5 } . What is the pH of this buffer solution?
The energy levels of a Helium Ion, He+, may be calculated from the Bohr Theory using z = 2 for the atomic number, En = -1312.04 Z2/n2 or En=-5248.16/n2 (kJ mol-1) for n=1, 2,3,.... Calculate the first 4 energy levels of He+
The wavelengths of the sodium doublet can be accurately measured despite the fact that they are very short. The IUPAC standard for the meter is, in fact, based on the wavelength of a particular line in the emission spectrum of the element krypton
Draw the major and minor resonance structure for the carbonate ion (CO3^-2). Include any formal charges, Indicate which are the major resonance structures and why.
calculate the pH of the 1 L solution of 0.25 M TRIS plus the addition of 0.05 M HCL. Show how many moles of TRIS and TRIS HCL are present after the addition of the HCL. Use the Henderson Hasselbalch equation to calculate the pH?
A buffer solution is.290M in a weak base through kB of 2.8*10-5 and .490M in the conjugate acid, what is the pH
Calculate the energy of a photon of electromagnetic radiation at each of the following frequencies (in J). 1. 103.7 MHz (typical frequency for FM radio broadcasting) 2. 1100 kHz
what is the partial pressure of argon? If the two flasksare connected through a stopcock and the stopcock is opened, whatis the total pressure?
A saturated solution of sodium nitrate contains 80 g NaNO3 per 100 g H2O. How many grams of NaNO3 must be added to a solution containing 25 g NaNO3 in 75 g H2O to make the solution saturated
what is the value of the ionization constant of the weak acid HX at 298 K? You may ignore the contribution of the self-ionization of water.
Compute the pH in the titration of 25.0mL of 0.200 M pyridine, C5H5N(aq) after addition of 37.0mL of 0.200 M HBr.
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