Helium is one of the noble gases of group O in the periodic table. density of helium, gas is equal to 0.1785 kg/m at 0C (32F or. Gaseous chemical element, symbol: He, atomic number: 2 and atomic weight 4,0026 g/mol. (Party supply stores add oxygen to prevent people from suffocating off of their tanks. Helium, gas weighs 0.0001785 gram per cubic centimeter or 0.1785 kilogram per cubic meter, i.e. You could probably get a tank from it from a chemistry supply store somewhere. This process is dangerous, however, as you'll both be working with very cold temperatures and have liquid methane running amok. Almost all the gasses will condense out before helium does, which means you'll end up with very pure helium left behind, with a minor impurity of neon. But mucking around with radioactive things is dangerous and can be quite expensive.Īs a note, you could probably extract it yourself if you have a natural gas well that you can access directly and a way to separate it out with fractional distillation. That's what an alpha particle is: A loose helium nucleus bouncing about. He-Cd laser) Pressurized gas instead of air (Formula 1) Cryogenics. Now, you can produce helium, technically. One liter of liquid helium expands to 750 liters of helium gas under normal or also. Also, it would've probably taken much more energy to form that helium compound than it would've to actually extracted it from the atmosphere. To do this, you can solve for n in the equation as Sal did, and get n PV / RT. However, this problem asks us to solve for the number of moles of gas, or n. That is, you can't extract it from any reaction, because you don't have anything that it reacted with already. We would multiply by T if we wanted to find something like pressure of volume.

Helium doesn't form any compounds, being a noble gas.

Helium gas formula