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?

The experimental molar mass doubles.

Explanation:

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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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in scientific notation, the value of the  speed of light in a vacuum

  will be written as 2.995 * 10^8. when this value is represented in the form of

  a * 10^b, then, a = 2.995 and b = 8.

the value of the speed of light in a vacuum given above can also be rounded up to approximately 300000000. in this case, the scientific notation will be written as 3 *10^8.