How many grams of oxygen are in a sample of 0.0625 mol O2? OA) 2.00 g
OB) 2.88 g
C) 1.00 g
OD) 32.0 g

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