1 mole of chlorine molecule has a mass 71 grams? Explain please.
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Refer to the explanation.
The chemical formula for the chlorine molecule (chlorine gas or diatomic chlorine) is \(Cl_2\), which means it is composed of two chemically bonded chlorine atoms. The mass of one mole of chlorine gas is its molar mass, and can be determined by multiplying its subscript by the molar mass of chlorine (atomic weight on the periodic table in g/mol), which is \(35.45 g/mol\).
\(MM_Cl2=(2×35.45 g/mol Cl)=71 g/mol\) (rounded to two significant figures)
All of the halogens, AND most of the elemental gases (certainly the ones with any chemistry) are BINUCLEAR…
And so chlorine is a halogen, and an elemental gas, and occurs as \(Cl_2\). And the molecule thus mass of \(2×35.45.amu….\)…i.e. equivalent to \(70.9.g.mol^-1\)…
We use could use this rationale to explain the molecular mass of \(O_2\), \(N_2\), i.e. \(32.00.g.mol^-1\), and \(30.00.g.mol^-1\)…chemists often speak of dioxygen or dinitrogen to emphasize this molecularity.