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Multiple choice

A particular sample of C contains 99% of 12C. The number of moles of 12C present in a 48.5 gram carbon sample is ________.

  1. 2

  2. 4

  3. 1

  4. 12

  5. 49.5

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Lets assume that 100% of the sample is 12C. As we know: moles = grams/molecular weight. This is approximately 4. The 1% that is not 12C is insignificant.

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