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A photocell is a device used to measure the intensity of light. In a certain experiment, when light of wavelength 630 nm is directed onto the photocell, electrons are emitted at the rate of 2.6 X 10-12 C/s (coulombs per second). Assume that each photon that impinges on the photocell emits one electron. How many photons per second are striking the photocell? How much energy per second is the photocell absorbing?
Explain which distilation method (fractional or simple) would be most appropriate to seperate hexanes and dichloromethane
The nuclide Pb-210 undergoes three successive decays (beta, alpha, and beta, respectively) to form a stable nuclide. What are the three nuclides which form from Pb-210 in this decay series
what mass of this substance must evaporate in order to freeze 230g of water initially at 16 degrees? the heat of fusion
What is the activation energy for the reaction shown below k=1.89x10^-8 /s at 540 K and 2.45 x 10^-7 at 601 K
Draw the resonance structures for 9-(hydroxymethyl)anthracene. Is it possible for all three rings to simultaneously have benzenoid character
Find the concentration of the HCL solution in moles/liter. b). How could the HCl soluted be diluted to make 1000ml of HCl solution with a concentration of 0.400M
Which of the following molecular geometries could lead to linear molecule after removal of one atom?
calculate the equilibrium constants at 25C for each of the following reactions. 1. 2CO(g)+O2(g) = 2CO2(g). CO; delta h=-110.5 delta g=-137.2 delta S=197.7. O2; delta H=0 .delta g=0 delta S=205.2
Chloroform (CHCl3) became popular as an anesthetic after Queen Victoria delivered her eight child as anesthetized by chloroform in 1853. Explain what is the density in grams per liter of chloroform at 35 degrees Celsius and 850torr
Problem- Use the following standard-state free energy of formation data to calculate the acid-dissociation equilibrium constant (Ka) at for formic acid: Compound Gf o (kJ/mol) HCO2(aq) -372.3 H+ (aq) 0.00 HCO2 - (aq) -351.0
What wold you prodict for the relative reactivity of 4-trifluoromehylbenzaldehyde in this aldol condensation reaction.
Complete the following equations: a. 105B + 10n -> ? + 42He b. 2310Ne -> 2311Na + ?
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