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Which of the following alkanes has a molecular weight closest to 72 g/mol?

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Question: Which of the following alkanes has a molecular weight closest to 72 g/mol?

Options:

  1. C5H12
  2. C6H14
  3. C7H16
  4. C8H18

Correct Answer: C6H14

Solution: 

C6H14 (hexane) has a molecular weight of approximately 86 g/mol, while C7H16 (heptane) has a molecular weight of approximately 100 g/mol. The closest is C6H14.

Which of the following alkanes has a molecular weight closest to 72 g/mol?

Practice Questions

Q1
Which of the following alkanes has a molecular weight closest to 72 g/mol?
  1. C5H12
  2. C6H14
  3. C7H16
  4. C8H18

Questions & Step-by-Step Solutions

Which of the following alkanes has a molecular weight closest to 72 g/mol?
  • Step 1: Understand that alkanes are hydrocarbons with the general formula CnH(2n+2).
  • Step 2: Calculate the molecular weight of alkanes using the formula: Molecular weight = (number of carbon atoms * 12) + (number of hydrogen atoms * 1).
  • Step 3: For C6H14 (hexane), calculate: (6 * 12) + (14 * 1) = 72 + 14 = 86 g/mol.
  • Step 4: For C7H16 (heptane), calculate: (7 * 12) + (16 * 1) = 84 + 16 = 100 g/mol.
  • Step 5: Compare the molecular weights: 86 g/mol for C6H14 and 100 g/mol for C7H16.
  • Step 6: Determine which molecular weight is closest to 72 g/mol. C6H14 is closer than C7H16.
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