If you fill a balloon with 6.83 grams of helium (He) gas, how many moles of helium are present in the balloon? moles (round to 3 sig figs)

The formation of a solid, also known as a is an indication of a chemical change. precipitate particulate particle powder

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

How many atoms are in 2 moles of phosphorus?