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Chemistry · Grades 9–12

Acyclic alkane hydrogen count

This rule requires an acyclic saturated hydrocarbon.

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Rule and assumptions

This rule requires an acyclic saturated hydrocarbon.

CₙH₂ₙ₊₂

Worked examples

An acyclic saturated hydrocarbon has 17 carbon atoms. How many hydrogen atoms does its molecular formula contain? Round to 3 decimal places if needed.

CₙH₂ₙ₊₂ 2 × 17 + 2 = 36

36

An acyclic saturated hydrocarbon has 2 carbon atoms. How many hydrogen atoms does its molecular formula contain? Round to 3 decimal places if needed.

CₙH₂ₙ₊₂ 2 × 2 + 2 = 6

6

Try two questions

  1. An acyclic saturated hydrocarbon has 6 carbon atoms. How many hydrogen atoms does its molecular formula contain? Round to 3 decimal places if needed.

  2. An acyclic saturated hydrocarbon has 14 carbon atoms. How many hydrogen atoms does its molecular formula contain? Round to 3 decimal places if needed.

Answers and reasoning

Answers and marking notes
  1. 14

    CₙH₂ₙ₊₂ 2 × 6 + 2 = 14

  2. 30

    CₙH₂ₙ₊₂ 2 × 14 + 2 = 30

Further reading and review references

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Learning preview · independent educational and translation review required. Suggested grades are not official curriculum alignment.