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An ordinary 3.0 V flashlight bulb draws roughly 0.25 A of current and converts about 1.0% of the electrical power into light (λ = 550 nm). If the flashlight beam initially has a cross-sectional area of 10 cm2:
(a) How many photons are emitted per second?
(b) How many photons are found in a cubic meter of the beam?
(c) What is the radiant emittance (W cm-2) of the beam as it leaves the flashlight?
Its undissociated form is red and its anionic form is yellow. What color would a methyl red solution have at pH = 7.0 ? Show your calculations. Hint: Determine the concentration ratio of methyl red and its conjugate.
A mixture of Helium, Neon, and Nitrogen gases has a pressure of 1.348 atm. Determine what is the partial pressure of N2 in the mixture If the pressures of Helium and Neon are 0.124 atm and 0.996 atm, respectively.
Which of the following is a use for nuclear energy?
The gas from a certain volcano had the following composition in mole percent (that is, mole fraction multiplied by 100). 56.0% CO2, 34% H2, 5.4% HCl, 2.4% HF, 2.1% SO2, and 0.1% H2S What would be the partial pressure of each of these gases if the t..
In the first step of the ostwald process, ammonia is reacted with oxygen gas to produce nitric oxide and water. What is the maximum mass of H2O that can be produced by combining 80.9g of each reactant?
At equilibrium the concentration of CO (g) was found to be 0.046 M. Calculate the equilibrium constant for the reaction equation at 527 degrees celcius.
Description of physical chemistry, Find delta Smix, delta Gmix, delta Hmix, and delta Vmix if 125 g of benzene and 25 g of naphthalene are mixed at 60 degrees C.
HF is a stronger acid than HBR because F has greater electronegativity than Br 2) the acid (HA) strength will increase when the H-A bond strength increases
The analysis showed 92% CO2, 2.2% NO, 1.7%SO2 and 4.1%H2O by mass. what is the partial pressure exerted by nitric oxide (NO)
For the reaction: N2(g) + 2 O2(g) ?? 2 NO2(g), Kc = 8.3 × 10-10 at 25°C. What is the concentration of N2 gas at equilibrium when the concentration of NO2 is twice the concentration of O2 gas
A substance has a molar mass of 60 g/mol with 40.0 percent carbon, 6.7 percent hydrogen, and 53.3 percent oxygen. What is its empirical formula?
Solutions A and B are separated by a semipermeable membrane that is permeable to K+, but not Cl-. Initially, Solution A is 0.5 L of 100 mM KCl, and Solution B is 0.5 L of 1 mM KCl.
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