Molecular Mass 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

Atacticity exist in the polymers is due to _____ arrangement of molecules.

The random arrangement of molecules in polymer chain is known as _____.

Write the structure of atactic polymer.

How does the molecules arranged in atactic polymer chain?

What are atactic polymers? Give examples.

The molecules arranged in alternate side of the polymer chain is known as _____.

The Syndiotactic polymer has the _____ pattern of arrangement of the molecules.

Give example for the syndiotactic polymer.

How Syndiotactic polymer are arranged?

Define Syndiotactic polymer.

The polypropylene is the example for _____ polymer.

Isotactic polymer is having the arrangement of molecule in _____.

How does isotactic polymers differ from others?

How does the molecules arranged in the isotactic?

Define Isotactic with examples.

Weight average molecular mass is _____ the number average molecular mass of the synthetic polymer.

The value of Poly dispersity index of the polydisperse polymer is _____.

Give the ratio between the weight and number average molecular mass.