Helium from one end of a 100 cm glass tube, X gas from the other end simultaneously sending. These two gas molecules are at a height of 80 cm from the end where helium gas is sent. they meet. So what is the X gas changing? (He: 4 g/mol)

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Stoichiometry

Stoichiometry is a chemical division that evaluates the quantitative content of the chemical process with the help of the reacting molecules or products taking part in the reaction. The term “stoicheion” in “Stoichiometry”, is an old Greek term for "element" whereas “metron” means "measure".