Jul 18, 2019 · $\pu{20 mL}$ of sulfur vapour at $\pu{1000 °C}$ reacts with $\pu{40 mL}$ of oxygen gas to form $\pu{40 mL}$ of sulfur dioxide gas. Determine the number of atoms in the molecule of sulfur in the vapour state at this temperature. My working out is as follows:

Jan 10, 2017 · Context is important. C is the atomic symbol for carbon and can represent not only the element, (but one or more) atoms of the element, as well as the element as it exists in the understood (implied) conditions. Same is true for O or N or actually any element. However, elemental O and N are both commonly found as diatomic molecules O 2 and N 2.

Jan 1, 2015 · That is why, for example, Avogadro admitted that nitrogen gas is diatomic, but his hypothesis does not directly prevent us from imagining that nitrogen gas actually contains $4$ nitrogen atoms by replacing all the previous formulas of other molecules which contain single atom of nitrogen with same formulas, but having $2$ nitrogen atoms instead ...

Dec 29, 2021 · Air is mostly molecules not atoms and most of the space in a gas is empty. Most of the gaseous components of air are not individual atoms but molecules (oxygen, nitrogen are diatomic, carbon dioxide and water vapour are triatomic). The only common single atom is argon (about 1% of the atmosphere by mole ratio).

Sep 23, 2017 · Take the interstellar medium. We have about 1 atom per cm³ in there and it is called a "gas". Now that's what I would call an isolated atom in the gas phase. An atom is an object that belongs into the realms of quantum mechanics. A solid, liquid or gas is something that belongs into our classical world.

Oct 30, 2015 · So if you carefully measure the reaction of hydrogen gas and oxygen gas to get water, you realize it's $\ce{H2O}$ based on the proportions, and then the atomic masses fall into place. We get further proof of $\ce{H2}$ from other compounds. Sodium bicarbonate clearly has a small amount of hydrogen and you can work out $\ce{NaHCO3}$.

Sep 4, 2015 · But when you are talking about atoms, you want to measure atoms, and the only way to have an undisturbed lone atom is to put it in a gaseous state. And of course, the resulting ion should be in that state, too; after all, you can't make a solid out of positive ions alone, and if you want to add negative ions to counterbalance them, an ambiguity ...

Nov 21, 2016 · Despite that, there are numerous compounds synthesized using noble gas atoms. The London dispersion force is a temporary attractive force that results when the electrons in two adjacent atoms occupy positions that make the atoms form temporary dipoles. This force is sometimes called an induced-dipole-induced-dipole attraction.

Dec 21, 2015 · When concentrated sulfuric acid is heated, then it decomposes via the reaction $$\ce{H2SO4 -> H2O + SO3}$$ I tried to determine under what circumstances the nascent oxygen (a free single atom of oxygen) is formed which would react with copper to create $\ce{CuO}$ but couldn't find the reaction in any modern source.

The reason is as simple as obvious: Entropy. If two noble gases would form a molecule/adduct, the bond/association energy of this molecule would have to compensate for the loss of entropy (Two volume elements would become one, hence the gas would have to expand to cover the room previously occupied, which requires work energy).