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Chemistry Question on Atomic Structure

The number of different chain isomers for C7H16\text{C}_7\text{H}_{16} is ______.

Answer

For a hydrocarbon with the molecular formula C7H16C_7H_{16}, which is an alkane, we can determine the possible chain isomers by drawing all unique structures with the same molecular formula.

The chain isomers for C7H16C_7H_{16} are as follows:

Straight Chain (Heptane):

CH3−CH2−CH2−CH2−CH2−CH2−CH3\text{CH}_3 - \text{CH}_2 - \text{CH}_2 - \text{CH}_2 - \text{CH}_2 - \text{CH}_2 - \text{CH}_3

Branched Chains (Various Isomers):

  • 2-Methylhexane
  • 3-Methylhexane
  • 2,2-Dimethylpentane
  • 2,3-Dimethylpentane
  • 2,4-Dimethylpentane
  • 3,3-Dimethylpentane
  • 3-Ethylpentane
  • 2,2,3-Trimethylbutane

Each of these structures represents a distinct arrangement of carbon atoms, satisfying the molecular formula C7H16C_7H_{16}.

Conclusion:

There are a total of 9 different chain isomers for C7H16C_7H_{16}.