Chlorine reacts with phosphorus to form a compound Q with relative molecular mass of 137.5. The compound contains 77.5 % of chlorine by mass. (a) Deduce the empirical formula of the compound Q. (Relative atomic masses: P = 31.0, Cl = 35.5) Constituent atoms P Cl % by mass Relative atomic mass Relative no. of mole of atoms Simplest mole ratio of atoms The empirical formula of compound Q is ____________________ (b) Find the molecular formula of Q. (c) Draw the electronic diagram of the compound Q, showing electrons in the outermost shell only.

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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".