Questions asked by Aubrey

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• A gas-filled balloon with a volume of 2.80 L at 1.20 atm and 20°C is allowed to rise to stratosphere (about 30 km above the surface of the Earth), where the temperature and pressure are −23°C and 3.00 × 10−3 atm, respectively. What is final volume?
  
• An automobile airbag inflates when #NaN_3# is converted to #Na# and #N_2# according to the equation, #2 NaN_3 rarr 2 Na + 3 N_2#. What volume (in L) of #N_2# would be produced if #168" g of NaN"_3# completely reacted at S.T.P.?
  
• An unknown amount of gas occupies 80.5 L at 1.93 atm and 298 K. How many moles does the sample contain? What is the mass if the gas is helium? What is the mass if the gas is argon?
  
• How many milliliters of a 2.6 M glucose solution contains 0.86 moles?
  
• What is the concentration of a solution formed by diluting 14.0 mL of a 4.4 M glucose solution to 355 mL?
  
• Hydrosulfuric acid, H2S, has two acid ionization constants. What is the equation that corresponds to the Ka value of Ka = 8.9 × 10^−8? and include states of matter in the answer
  
• What is the molarity of an HCl solution if 25.0 mL of a 0.13 M NaOH solution are needed to neutralize 30.0 mL of the sample?
  
• How many liters of 44.70 M nitric acid contain 46.36g HNO3 (63.01 g/mol)?
  
• Is HCOOH the conjugate acid of the basic formate ion (CHOO^-)?
  
• What is the molar concentration of 254.2 x 10^-3 L of an H2CrO4 (chromic acid) solution that required 975.9 mL of a 0.1430 M standard solution of LiOH for complete neutralization?
  
• Which of the following corresponds to a final volume of a #12.89 * 10^(-3)# #"M"# solution prepared by the dilution of #"27.9 L"# of a #"433.0-mM"# solution?
  
• A solution of a mixture of formic acid and formate ion is analyzed and found to contain 0.669 mM formic acid and 0.444 mM formate ion. What is the pH of this solution (the Ka of formic acid is 1.78×10^-4?
  
• What is [H3O+] for a buffer solution that is 0.200 M in acid and 0.500 M in the corresponding salt, if the weak acid's Ka = 5.50 × 10−7?
  
• Calculate the density of gold if the mass of a 8.1cm x 4.3 cm x 1.8 cm gold bar is 1.211 kg? answer in units of g/ml
  
• A patient ingested barium−131. How much time will elapse until only 1/32 of the barium−131 remains, assuming that none of the isotope is eliminated from the body through normal processes? Answer in minutes
  
• What is the product of this reaction?
  
• What is the product of reacting benzene with #"1 mol"# of #"Cl"_2# catalyzed by #"FeCl"_3# in heat?