1 mole of chlorine molecule has a mass 71 grams? Explain please.

Question

Luna Chen · Accepted Answer

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"=(2xx"35.45 g/mol Cl")="71 g/mol"# (rounded to two significant figures)

Natalie Anton · Answer

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 #2xx35.45*"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.

Cooper Adams · Answer

undefined No, 1 mole of chlorine molecules does not have a mass of 71 grams. The molar mass of a chlorine molecule (Cl₂) is approximately 70.9 grams per mole, which is calculated by adding the atomic masses of two chlorine atoms (35.45 g/mol each). Therefore, 1 mole of chlorine molecules has a mass close to 70.9 grams, not 71 grams.