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What is the energy in joules of a mole of photons associated with visible light of wavelength 486 nm? (c = 3.00 x 10^8 m/s; h = 6.63 x 10^-34 J x s; NA= 6.022 x 10^23 moles-1)· 6.46 x 10^-16 J· 6.46 x 10^-25 J· 2.46 x 10^-4 J· 12.4 kJ· 246 kJ
Why are monochromators (prism or grating monochromators) used in scanning instruments as opposed to absorption filters for
Phenylephrine is a nasal decongestant and is the active ingredient in Sudafed, which contains phenylephrine hydrochloride (PEHCL). The conjugate acid (PEH+)
The initial pH. the volume of added base required to reach the equivalence point the pH at 12.0 mL of added base
The accompanying diagram shows how ?H (red line) and T?S (blue line) change with temperature for a hypothetical reaction. What is the significance of the point at 300 K, where ?H and T?S are equal?
She pours a 50.0 mL sample of water at 345 K into the calorimeter containing a 50.0 mL sample of water at 298 K. She carefully records the final temperature of the water as 317 K. What is the value of Ccal for the calorimeter?
Carbon monoxide reacts with oxygen gas to produce carbon dioxide. A gaseous mixture contains 0.85 g of carbon monoxide and 0.73 g of oxygen gas. After the reaction is complete, what mass of carbon dioxide is formed? Which reactant is in excess?
It takes 1.35 kJ of energy to heat a sample of pure silver from 12.0°C to 15.5°C. Calculate the mass of the sample of silver.
Determine the dissociation constants for the following acids. Express the answers in proper scientific notation where appropriate
Using the concepts of equilibrium and Le Chatelier's principle, explain why oxygen moves from the air in the lungs to cells and carbon dioxide moves from cells to the air in the lungs.
if 8.40 grams of C are burned, how much heat will be released for the following balanced reaction: C + O2 -> CO2 + heat (393 KJ)
How much time is required for a 6.85 sample of to decay to 0.500 if it has a half-life of 27.8 days
Write the charge-balance as well as the mass-balance equations for the system (let s represent the solubility of the calcium fluoride). And solve the equilibrium problem to determine the solubility of the CaF2
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