Molecular Masses of Polymers

In a polymer sample $30\%$ of molecules have a molecular mass of $20,000, 40\%$ have $30,000$ and the rest $60,000.$ What is the weight average molecular mass of the polymer?

Formation of polyethylene from calcium carbide takes place as follows
${\mathrm{CaC}}_2+2{\mathrm{H}}_2\mathrm{O}\to \mathrm{Ca}(\mathrm{OH}{)}_2+{\mathrm{C}}_2{\mathrm{H}}_2$
${\mathrm{C}}_2{\mathrm{H}}_2+{\mathrm{H}}_2\to {\mathrm{C}}_2{\mathrm{H}}_4$

The amount of polyethylene obtained from $64 \mathrm{kg}$ of ${\mathrm{CaC}}_2$ is

A polymer sample is made up of $30\%$ molecules of mass $20,000,40\%$ of $30,000$ and the rest mass of $60,000$ . Its number average molecule mass is

The most suitable method for determination of the molecular mass of polymer is?

In a polymer sample, the molecular weight of $30$ molecules is $25,000$, molecular weight of $25$ molecules is $30,000$ and molecular weight of another $40$ molecules is $43,000$ then calculate the weight average molecular weight (${\stackrel{-}{\mathrm{M}}}_{\mathrm{w}}$) of the polymer.

In a polymer sample, the molecular weight of $10$ molecules is $20,000$, molecular weight of $30$ molecules is $35,000$ and molecular weight of another $20$ molecules is $40,000$ then calculate the number average molecular weight (${\stackrel{-}{\mathrm{M}}}_{\mathrm{n}}$) of the polymer.

Explain the determination of molecular mass of polymers by number average molecular weight method.

Polymer properties are closely related to their molecular mass, size and _____ .

Define molecular mass of a polymer.

Explain the method of determining the molar mass of the polymer.

In a polymer sample, the molecular weight of $20$ molecules is $20,000$, molecular weight of $40$ molecules is $30,000$ and molecular weight of another $20$ molecules is $40,000$ then calculate the number average molecular weight (${\stackrel{-}{\mathrm{M}}}_{\mathrm{n}}$) of the polymer.

Explain the determination of molecular mass of polymers by weight average molecular weight method.

Write a short note on molecular mass of polymers.

Why molecular weight of polymers is taken as average molecular weight. How many types average molecular weight can be represented? Explain each type.

Why PDI of proteins is one?

What is polydispersity index? Explain.

Write formula for number average molecular weight (${\stackrel{-}{\text{M}}}_{\text{n}}$).

The poly dispersity index (PDI) of the polymer is given by which equation if ${\overline{\mathrm{M}}}_{\mathrm{W}}$ is the weight average molecular weight and ${\overline{\mathrm{M}}}_{\mathrm{n}}$ is the number average molecular weight of a polymer.

Cotyledons are also called-

What is the polydispersity index of polymer if the mass average molecular mass & number average molecular mass of a polymer are respectively 40,000 and 30,000?