Question

if there are 10^20 molecules/g of pvc, calculate a) the weight of an individual polymer molecule. I did 1/10^20 *advogados # and got 6022? is this right? b) the Molecular weight g/mole of polymer. my answer was 1e^-20. is this correct? c) the degree of polymerization of the polymer I not sure on this one. I know its gonna be like 1e^20/ something????

Answer 1

SOLUTION

(a) Mass of 10²⁰ molecules = 1 g

Therefoe mass of one molecule = 1 / 10²⁰ = 1.0 X 10^-20 g

(b) one molecule weight 1.0 X 10^-20 g

Therefor one mole ( or 6.022 X 10²³ ) will weigh  1.0 X 10^-20 g X 6.022  X 10²³ = 6022g

(c) NOTE: Incomplete info for this part.

The degree of polymerisation is the number of mer units in a polymer. It can be calculated as:

DP = Mn / Mo, Mo = molecular mass of monomer. Mn = number average molecular weight = NiMi. Ni is the number of monomer units. Ni is not given