Questions asked by Student2020

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• Dry air near sea level has the following composition by volume: N2, 78.08 percent; O2, 20.94 percent; Ar, 0.93 percent; CO2, 0.05 percent. The atmospheric pressure is 1.00 atm. Calculate the concentration of each gas in moles per liter at 0°C?
  
• 2 NO(g) + O2(g) → 2 NO2(g) Suppose that at a particular moment during the reaction nitric oxide (NO) is reacting at the rate of 0.070 M/s. (a) At what rate is NO2 being formed? (b) What rate is molecular oxygen reacting?
  
• A first-order reaction has rate constants of 1.5 ✕ 10-2 s-1 and 7.8 ✕ 10-2 s-1 at 0°C and 20.°C, respectively. What is the value of the activation energy?
  
• A 300g ball at rest is struck with a bat with a force of 150N. If the bat was in contact with the ball, for 0.02 seconds, what is the ball's velocity?
  
• The equilibrium constant Kc for the reaction is 3.8 10-5 at 727°C. What are Kc and Kp for the following equilibrium at the same temperature?
  
• If pure phosgene at an initial pressure of 1.1 atm decomposes, what are the equilibrium pressures of all species?
  
• a) What is the acceleration of the blocks? b) What is the net force on each block? c) What is the tension in the string?
  
• How do you write balanced, net ionic equations for 1). #"Cu"^(2+) and text(F)^-#, and #"Cu"^(2+) and "Cl"^-#?
  
• What is the #"pH"# of a #"0.49-M"# #"NaClO"# solution?
  
• What are the pH of the solutions?