Natural water contains approximately ______________ percent of heavy water?
Correct answer: A. 0.015
- A. 0.015
- B. 0.71
- C. 1.2
- D. 3.5
Explanation
Natural water contains about 0.015% deuterium oxide, or heavy water, mainly because a small fraction of hydrogen is naturally present as deuterium. The larger values listed are far above its normal natural abundance.
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