Some liquids have enough attractions between molecules to form dimers. (Dimers are molecules formed from the combination of identical molecules, A + A → A2.) What effect would this have on the experimental molar mass?

Question

Nichols

Chemistry

5 July, 05:51

Some liquids have enough attractions between molecules to form dimers. (Dimers are molecules formed from the combination of identical molecules, A + A → A2.) What effect would this have on the experimental molar mass?

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Answers (2)

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Ross Phillips · Answer 1

The experimental molar mass doubles.

Explanation:

Hello,

In this case, dimers are understood as the gathering of two monomeric units of a polymerizable molecule, thus, if a molecule A monomer has a specific molar mass, say, 100g/mol determined experimentally, if it forms a dimer, its molar mass get doubled since the resulting dimer will be A₂, therefore the assumed experimental molar mass will be 200 g/mol since two A molecules were gathered.

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Melendez · Answer 2

The molar mass would double

Explanation:

This would double the molar mass. Even though this question is about a liquid but we can use an example we see a lot in elements like oxygen, flourine, nitrogen and others whose atomic attractions make them exist as diatomic gases. This is why their molar masses are twice their relative atomic masses (in grams). The same thing would happen here. The molar mass of A would have to double.