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Determine the energy of 1.70 of photons for each of the following kinds of light. (Assume three significant figures.)
A solution is prepared by adding 0.14 mole Na2HPO4 and 8.2 grams of NaH2PO4 to sufficient water to prepare a 1.00 L solution. What is the pH of the solution?
calculate the volume percent and the proof of the ethanol in the unknown solution based on this mass percent. Use the graph from the Introduction that plots the density of ethanol solutions from 20 to 60 mass percent to answer the following questi..
explain why this series of reaction will produce the 3,5-dibromotoluene and direct bromination of toluene produces the 2,4-dibromotoluene.
Which of the following is true about ionic bonds?
Use the ion-electron method to balance each of the redox reactions
An Nd:YAG laser emits photons at 1064 nm in a pulse of 5.0 ns duration with a total energy of 300 mJ. What is the power (energy per time) associated with such a pulse. How many photons are emitted in such a pulse.
the diffusion coefficient for nitrogen in the metal at 1150 C is 1x10^-11 m^2/s and the end is 3.5 kg/m^3, what is the nitrogen concentration at a position 2mm into the sheet away from higher concentration end?
Compute the number of moles of sodium hydroxide ( NaOH ) in 23.75cm 3 of 0.150moldm -3
A student standardized her I2 solution by preparing a solution of 0.0450 g of ascorbic acid (vitamin C) in a 100 mL volumetric flask. She titrated several 10.00 mL samples of the Vitamin C solution and found an average of 24.95 mL of I2 solution
you are a manufacturer of antacids. you could use either mg (oh)2 or al(oh)3 in your formulation. you can buy either of these for $2.00 per pound.
If the cylinder then sits in the storage at 293 K for a long time, what is the entropy change of the universe (from the original unfilled state)?
Use the tabulated data below to calculate x, s, and % RSD using your hand held calculator. Show all of your calculations for full credit.
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