What is the standard reduction potential, e, for the half-reaction Zn2+(aq) +2e → Zn(s)? A. -0.76 V
B. -1.68 V
C. -2.37 v
D. -2.71 V

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