Question

How many repeat units are required to make a nylon polymer with a formula weight of 15,000 amu?

Answer 1

This problem is giving information about a nylon polymer whose molar mass is 15,000 amu (atomic mass units).

The first subject of matter here, is to recall the monomeric molecular formula of nylon which is C₁₂H₂₂N₂O₂, and the definition of monomer (basic molecule able to react and form a polymer) and polymer (assembling of monomers).

Next, we calculate the molar mass of the monomer of nylon:

$12*12.01+22*1.01+2*14.01+2*16.00=226.31amu$

Finally, the number of units is calculated by dividing the molar mass of the polymer and the monomers:

$n=\frac{15000}{226.31} =66.2$

Which is about 66 monomers.

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