The chemical formula for hydrogen gas is H2. Its molar mass is 2.016 grams per mole, and it exists as a gas at standard temperature and pressure, where its density is 0.09 grams per liter. Hydrogen's melting point is -43... More »

Ammonia's chemical formula is NH3. Composed of nitrogen and hydrogen, this colorless gas has a molar mass of 17.03 g/mol (grams/mole). More »

The chemical formula for potassium hydroxide is K(OH). This compound is formed by one atom of potassium and one molecule of hydroxide, which is formed by one atom each of oxygen and hydrogen. More »

H2 is the chemical formula for dihydrogen, also known as diatomic hydrogen, hydrogen gas and molecular hydrogen. This is the naturally existing form of elemental hydrogen. More »

Ammonia is the chemical name for the molecular formula NH3, which is a compound of nitrogen and hydrogen. It is also known by the name azane. More »

It takes only one atom to make hydrogen; however, hydrogen is commonly found as H2, meaning two atoms make up hydrogen. Because of this, hydrogen is known as a diatomic element. More »

The lightest element is hydrogen, H2, which is also the most common. Hydrogen is very reactive and forms water when it interacts with oxygen. More »