34. What is the [OH-) in a solution where (H+) = 2.9 x 10^-9? a. 8.54 b. 2.9 x 10-23 c. 2.9 x 10-9 d. 3.4 x 106 e, none of the above​

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