Dental Admissions Test (DAT) Practice Test

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If an unknown compound contains 48.02% carbon, 18.74% hydrogen, and 33.24% nitrogen, what is its empiric formula?

  1. a. CHN

  2. b. C4H23N2

  3. c. C5H24N3

  4. d. C6H30N4

The correct answer is: c. C5H24N3

A) Option A is incorrect because the percentages given do not match up. The compound contains more carbon than hydrogen and nitrogen combined, and the empiric formula should reflect that. B) Option B is incorrect because the compound contains too much hydrogen and not enough carbon compared to the given percentages. D) Option D is incorrect because the compound contains too much carbon and not enough hydrogen compared to the given percentages. The correct answer is C as the percentages given can be simplified to a 15:1 ratio of carbon, hydrogen, and nitrogen respectively, which matches the formula C5H24N3. This is the simplest whole number ratio that reflects the percentages given.

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