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The electron in the n = 5 level of a hydrogen atom emits a photon with a wavelength of 1280 nm. To what energy level does the electron move?
An empty 2.00 L flask at 250.°C was filled with PCl5(g) to a pressure of 0.249 atm, and then the PCl5 was allowed to decompose as shown below.
What is the density of a substance if a 2.50mL sample has a mass of 0.880g at room temperature? ( show calculations) What is the specific gravity of the substance?
How many different signals are expected for this molecule? That is, how many magnetically different hydrogens are present in the molecule? This is in general determinted by differences in bonding, and distance to an electronegative group.
Calculate the mass of glucose in a 110 sample of a 1.14 M glucose solution.
What if you were designing an engine for a SUV that produced 2.40 × 102 L/s of exhaust with a CO content of 1.9 mg CO per 1L of exhaust? What volume of catalytic matrix would you need to reduce the CO emission in this automobile?
A solution containing 82.0 g of ascorbic acid dissolved in 230 g of water has a density of 1.22 g/mL. Calculate the molarity of ascorbic acid in the solution.
A solution of ethanol (C2H5OH) in water is prepared by dissolving 60.0 mL of ethanol (density = 0.79 g/cm3) in enough water to make 235.0 mL of solution. What is the molarity of the ethanol in this solution?
In the first step of the synthesis of PABA, why was it necessary to add sodium acetate to have reaction of p-toluidine with acetic anhydride?
Use bond enthalpies to estimate the enthalpy change for the following gas-phase reaction.
calculate the number of NaCl formula units formed when 176 Na atoms and 98 Cl2 molecules react?
the sample has a mass of .211 grams,a volume of .25 and a temperature of 275K at a pressure of .945 atmospheres. What is the most likely element forming the sample?
Describe the fictional portrayals of the courtroom, including the trial process, the roles of the prosecution and defense, the roles of the courtroom participants (expand your response from the Week Five CheckPoint), and the handling or implementa..
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