What equals the molar mass of an element? a)The atomic mass of the element expressed in grams

b)The atomic number of the element expressed in grams

c)The mass number of the most common isotope of the element expressed in grams

d)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