Answer:
So ²³⁵UF₆ effuses 1.0043 times faster than ²³⁸UF₆
Explanation:
The rate of effusion of two gases A and B can be expressed by <em>Graham's law</em>:
Where M is the molar mass, and in this case A is ²³⁵UF₆ while B is ²³⁸UF₆.
So now we <u>calculate the molar mass of each mass</u>:
²³⁵UF₆ ⇒235 + 6*19 = 349 g/mol
²³⁸UF₆ ⇒238 + 6*19 = 352 g/mol
Putting the data in Graham's law:
= 1.0043
So ²³⁵UF₆ effuses 1.0043 times faster than ²³⁸UF₆.
Answer:
8544
Explanation:
Given:
An alternating copolymer,
thus, the number of both types of repeat units will be the same.
average weight of a poly(styrene-butadiene) = 1,350,000 g/mol
and,
there are 8 atomes of carbon and 8 atoms of hydrogen in the styrene repeat unit,
also, There are 4 atoms of carbon and six atoms of hydrogen in butadiene repeat units.
Therefore,
when the styrene-butadiene is combined the total number of carbon atoms in a molecule will be ( 8 + 4 ) i.e 12 atoms
and, the total number of Hydrogen atoms will be ( 8 + 6 ) i.e 14 atoms
Therefore, the total molecular weight will be
m = 12 × Molecular weight of the carbon + 14 × Molecular weight of the hydrogen
or
m = 12 × 12 g/mol + 14 × 1 g/mol
or
m = 158 g/mol
Now,
the average number of styrene and butadiene mer units per molecule will be
=
= 8544.30 ≈ 8544