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qid 3596 · chemistry

Question: John Dalton found water to be 12.5% hydrogen by weight. Calculate the atomic weight of oxygen if Dalton assumed water contained two hydrogen atoms for every three oxygen atoms. Assume 1 H atom weighs 1amu.

  1. 7.3amu
  2. 10.0amu
  3. 9.5amu
  4. 3.5amu
  5. 5.2amu
  6. 6.7amu
  7. 4.67amu
  8. 2.4amu
  9. 8.0amu
  10. 12.0amu

Our answer: G. 4.67amu Source quote machine-checked (exact quote)

A machine check confirms the quoted words appear at the source. A person has not yet reviewed these. EARN MARKS as a Human Reviewer

How it was answered

Stored method, replayed by code (kind: formula)

card: formula · card sha256 31837ec1824bd620…

Current source

Chemistry LibreTexts, Chem 1300 Preparatory Chemistry, 6.03 Percent Composition

https://chem.libretexts.org/Courses/University_of_Arkansas_Little_Rock/Chem_1300:_Preparatory_Chemistry/Learning_Modules/06:_Counting_Molecules_through_Measurements/6.03:_Percent_Composition

“If you are counting atoms, it is mostly hydrogen. If you are measuring the mass, it is mostly oxygen.”

Source quote machine-checked (exact quote)

retrieved 2026-09-18T00:10:15.657Z

page text sha256 3c6a3e7cf9c82e6f… · content sha256 27a913fc87cc3b60…

addendum formula_qid3596.formula_ADDENDUM_source_rs20260918T001015Z · sha256 b441c653889e7a5b… · replaces the version below, addendum sha256 7330af7bcb98bedd…

Earlier version (superseded)

https://openstax.org/books/chemistry-2e/pages/3-2-determining-empirical-and-molecular-formulas

Source weak (http_get_200_text_and_question_terms)

retrieved 2026-09-17T01:43:30.565Z

page text sha256 9e0d4b65a65f0c5d… · content sha256 —

addendum formula_qid3596.formula_ADDENDUM_source_bf20260917T014330Z · sha256 7330af7bcb98bedd… · replaces the version below, addendum sha256 48cc9dab94874ffe…

Earlier version (superseded)

No public source has been found for this card yet (2 places checked internally).

addendum formula_qid3596.formula_ADDENDUM_source · sha256 48cc9dab94874ffe…

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