A sample of polydifluoroethylene is determined to have an average molar mass of 4.8 x 10^4 g mol^{-1} - HSC - SSCE Chemistry - Question 13 - 2019 - Paper 1
Question 13
A sample of polydifluoroethylene is determined to have an average molar mass of 4.8 x 10^4 g mol^{-1}.
Approximately how many carbon atoms are there in an average m... show full transcript
Worked Solution & Example Answer:A sample of polydifluoroethylene is determined to have an average molar mass of 4.8 x 10^4 g mol^{-1} - HSC - SSCE Chemistry - Question 13 - 2019 - Paper 1
Step 1
Calculate the average molar mass of the polymer
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Answer
The average molar mass of the polydifluoroethylene is given as 4.8 x 10^4 g mol^{-1}.
Step 2
Determine the molar mass of a single carbon atom
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Answer
The molar mass of a carbon atom (C) is approximately 12 g mol^{-1}.
Step 3
Calculate the number of carbon atoms in an average molecule
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Answer
To find the number of carbon atoms per molecule, divide the average molar mass of the polymer by the molar mass of a carbon atom:
extNumberofCarbonAtoms=12 g mol−14.8×104 g mol−1≈4000
Step 4
Select the correct option
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Answer
Thus, the approximate number of carbon atoms in an average molecule is 4000, which corresponds to option D.
