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The electron in a hydrogen atom falls from an excited energy level to the ground state in two steps, causing the emission of photons with wavelengths of 2624 nm and 97.2 nm, respectively. What is the principal quantum number or shell of the initial excited energy level from which the electron falls?
What is the the structures of both products and how can you distinguished them using IR spectroscopy?
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?
an aqueous solution is prepared by diluting 3.30mL acetone, CH3COH3, (d= 0.789g/mL) with water to a final volumeof 75.0 mL. The density of the solution is 0.993 g/mL. what are the molarity and the molality of acetone in this solution?
Imagine that you have a 7.00 litre gas tank and a 3.00 litre gas tank. You need to fill one tank with oxygen and the other with acetylene to use in conjunction with your welding torch.
a 93 L sample of dry air cools from 145 degrees C to -22 degrees C while the pressure is maintained at 2.85 atm. what is the final pressure?
If the pressure of CO2 is 0.550 atm, what concentration of carbon dioxide can be dissolved in water at 0.00C.
Draw both extended and Fischer representation of each of these compounds.
If 975g of copper is heated from 20 degrees C to 80 degrees C what amount of heat is absorbed?
What is the pH at the point during a titration when 22 mL of 0.200 M HCl has been added to 33 mL of 0.0500 M NH3 solution? HCl is strong acid, Kb = 1.8 × 10-5 for NH3. Answer in units of pH
a sample contains both KBr and KI in the unknown quantities. If the sample has a total mass of 5.00g and contains 1.51g K, what are the percentages of KBr and KI in the sample by mass?
A solution is made by dissolving 18.4g of HCl in 662 mL of water. Calculate the pH of the solution. Assume that the volume of the solution is also 662 mL
Consider H2, D2, and H20, treated as ideal gases at pressures of 1 atm and temperatures of 293.2 K.
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