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FinnZ [79.3K]
1 year ago
10

The polypropylene (repeat unit CH₃CHCH₂) in a plastic toy has a molar mass of 2.8x10⁵ g/mol and a repeat unit length of 0.252 pm

. Calculate the radius of gyration.
Chemistry
1 answer:
VMariaS [17]1 year ago
4 0

Polymer can be defined as the large molecule which is made up of repeating units of smaller molecules which are linked by covalent bonds.

Polymer mass : The molecular weight of the polymer is called as polymer mass.

μ(polymer)=μ(repeat)∗n                     where n is degree of polymerization.

Rg=  √(nl2/6R)

where,                                                 R = Radius of gyration.

n = degree of polymerization.

l = length of each repeating unit.

for calculating n;

MPolymer= Mrepeat∗n

=(2.8∗10^5g/mol)=[42.08g/mol]∗n

n=(2.8∗105g/mol)/(42.08g/mol)=6.7∗103.n

The molar mass of repeating unit = 42.08 g/mol

Rg= √(  nl2/6R )

=  √ (6.7∗103∗(0.252∗10^(−10))2 /6)

 Rg= 8.4pm radius of gyration.

To know more about Radius of gyration here

brainly.com/question/15515779

#SPJ4

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5.60 g of an unknown gas at STP fills a 500 mL flask. What is the molar mass of the gas
ale4655 [162]

Hey there!

From ideal gas equation we know,  PV = nRT

All the terms have their usual significance.

PV =w/M * RT

( where , n is number of moles = w/M,   we = weight of gas, M = molecular weight of the gas)

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At standard conditions ,  value of pressure, P = 1atm and standard temperature, T = 273K

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Given that, weight of gas,

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V = 500mL = 0.5 Liters

Therefore, substituting all the value, we get   :

  Molar mass = 5.60 * 0.082 * 273 / 1 * 0.5

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marishachu [46]

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Explanation:

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