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Explain the ozone molecules in the upper atmosphere stratosphere absorb much of the UV radiation from the sun. Explain the temperature of the stratosphere is -23.0ºC as well as the pressure due to the zone is 1.4 x10-7 atm. Compute the number of ozone molecules present in 1.00 m3 (1L = 10-3 m3) in the stratosphere.
Calculate the pH of a buffer solution that is 0.250 M in HCN and 0.170 M in KCN. For HCN, Ka = 4.9 x 10^-10 (pka = 9.31). Use the equilibirum approach to calculate
The enthalpy of combustion of benzoic acid (C6H5COOH) is commonly used as the standard for calibrating constant-volume bomb calorimeters; its value has been accurately determined to be 3226.7 kJ/mol.
what is the total number of joules absorbed by 65.0g of water when the temperature of the water is rasied from 25.0 c to 40,0 c?
At 4.00 rm L, an expandable vessel contains 0.864 mol of oxygen gas. How many liters of oxygen gas must be added at constant temperature and pressure if you need a total of 1.96 mol of oxygen gas in the vessel.
A 5.00-mL sample of a sulfuric acid solution of unknown concentration is titrated with a 0.1401 M Sodium Hydroxide solution. A volume of 5.99 mL of the base was required to reach the endpoint. What is the concentration of the unknown acid solution
A 2.5-L sample of a 6.3M NACl solution is diluted to 75L.What is the molarity of the diluted solution?
Lithium has only two naturally occurring isotopes. The mass of lithium-6 is 6.01512 and the mass of lithium-7 is 7.01601. Use the atomic mass of lithium to calculate the relative abundances of the two isotopes.
at 700ordmc keq 0.0152 for the following reaction2so2g o2g 2so3gwhat is numerical value of the equilibrium constant
A 4760 g sample of a solution of the solute tetrahydrofuran in the solvent benzene that has a concentration of 37.4 parts per hundred by mass tetrahydrofuran is available. Calculate the amount (kg) of C4H8O that is present in the sample.
the valve between them is opened and the gases are allowed to mix. What would be the final pressure in torr after mixing, if initially C3H8 is in the first flask (Volume = 4.000 L)
Why can you not prepare a solution of pH=8 by diluting sufficiently a 0.01M solution of HCl with water
If 0.150 mole of a nonvolatile, non electrolyte solute is dissolved in 800 grams of water, what are the ideal melting and boiling point of the solution
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