For the second-order reaction below, the concentration of the product, B, after 444 seconds is 0.0730 M. If no B is initially present, and the initial concentration of A is 0.744 M, what is the rate constant? 2A --> B rate = k[A]^2

Before it was launched, a helium-filled balloon had a pressure of 201 kpa at a temperature of 27°c. at an altitude of 15,000 m, the pressure had decreased to 2.5 kpa and the temperature had dropped to -14 °c. the volume of the balloon increased to 59.3 m3. what is the original volume of the balloon? 13 m3 0.85 m3 0.077 m3 1.17 m3