An alternating copolymer is known to have a number-average molecular weight of 100,000 g/mol and a degree of polymerization of 2210. If one of the repeat units is ethylene, which of styrene, propylene, tetrafluoroethylene, and vinyl chloride is the other repeat unit? a. vinyl chloride
b. propylene
c. tetrafluoroethylene
d. styrene

d. Styrene

Explanation:

An alternating copolymer repeat unit types if the other is Styrene. The equation to calculate m is :

m = Mn / Dp

m = 100,000 / 2210 = 45.25g/ mol

alternating copolymer is chain fraction than of each repeat unit type then chain fraction is styrene and unknown repeat units.

the equation above shows how temperature f, measured in degrees fahrenheit, relates to a temperature c, measured in degrees celsius. based on the equation, which of the following must be true?

a temperature increase of 1 degree fahrenheit is equivalent to a temperature increase of

5

9

degree celsius.

a temperature increase of 1 degree celsius is equivalent to a temperature increase of 1.8 degrees fahrenheit.

a temperature increase of

5

9

degree fahrenheit is equivalent to a temperature increase of 1 degree celsius.

a) i only

b) ii only

c) iii only

d) i and ii only