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One watt (W) is equal to 1 J/s. Assuming that 5.0% of the energy output of a 75 W lightbulb is visible light and that the average wavelength og the light is 550 nm, how many photons are emitted by the lightbuld each seond?
The generic metal hydroxide M(OH)2 has Ksp= 6.64x10^-18. (Note: In this particular problem, because of the magnitude of the Ksp and the stoichiometry of the compound, the contribution of OH from water can be ignored. However, this may not always b..
Calculate the equilibrium constant for the reaction - flask at a certain temperature according to the reaction
A gas occupies 1.55 L at 0.80 atm. What pressure would the gas exert if the volume were allowed to increase to 3.50 L?
0.01M HCl reacts with 3.18 g Na2CO3. Here 50 mL of HCl is required for the reaction. Calculate the volume of CO2 produced at 273 K and 1 atm.
A sample containing both enantiomers is found to have an observed rotation of +0.87 degrees in a one dm tube at a concentration of 0.025 g/mL. What is the optical purity of the sample? What is the % of the dominant enantiomer in this sample?
calculate the energy of a photon of light with a wavelength of 360nm.
Using the de Broglie wave equation, calculate the speed, in m/s, at which an electron must travel to have a wavelength of 25.0 pm?
The mass ratio of sodium to fluorine in sodium floride is 1.21:1. a sample of sodium fluoride produced 26.5g of sodium upon decomposition how many grams of fluorine was formed.
A 1.0 ounce piece of chocolate contains 15 of caffeine, and a 6.0 ounce cup of regular coffee contains 105 of caffeine.How much chocolate would you have to consume to get as much caffeine as you would from 5.0 cups of coffee?
What is the speed of an electron ejected from a metallic surface, where the metal work function is 2.06 eV and the radiation is at the following wavelengths
a 0.050 molar solution of a weak monobasic (accepts one proton) substance, B has a pH of 10.98 Determine the ionization Constant Ka of this acid.
A 20 mg sample of zinc is heated at 10 K min-1, and the peak on the DSC trace has an area of 0.371 W K. Calculate the latent heat of melting of zinc (in kJ mol-1)?
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