Which compound makes up nearly 30% of the "aroma" from human sweat?

For ai it's atomic number is 13 and it's mass number is 27 how many neutrons does it have

In apex! a liquid heated beyond a certain temperature becomes

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