In the process of preparing liquid air for fractional distillation, one fraction will be separated as a solid. What is the chemi
1 answer:
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Answer:
Explanation:
In Polystrene, the molecular formula for the repeat unit = ;
and the atomic weights of Carbon C = 12.01 g/mol
For Hydrogen, it is 1.01 g/mol
Hence, the repeat unit molecular weight is:
m = 8 (12.01 g/mol)+8(1.01 g/mol)
m = 96.08 g/mol + 8.08 g/mol
m = 104.16 g/mol
The degree of polymerization = no-average molecular weight/repeat unit molecular weight.
Mathematically;
Answer:
Age of the atifact is years
Explanation:
- For first -order radioactive decay-
represents activity of radioactive nuclide after t time,
represents initial activity of radioactive nuclide and
represents half-life
- Here,
,
and
Plug-in all the given values in the above equation-
or,
So, age of the atifact is years