The mass percentage of nitrogen contained within urea is________________?
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Answer: B. 46%
Explanation
Urea has the chemical formula CO(NH2)2 with a calculated total molar mass of sixty grams per mole. Two nitrogen atoms contribute twenty-eight grams per mole to the overall molecular weight. Dividing the nitrogen mass by total molar mass yields approximately forty-six percent nitrogen content. Mass percentage calculations determine the relative contribution of each constituent element to a compound's mass. Urea is a major nitrogen-containing metabolic waste product excreted by mammals in liquid urine. Friedrich Wohler synthesized urea artificially in eighteen twenty-eight, disproving strict vitalism theories in chemistry.
Urea is produced on a massive global scale to serve as a high-nitrogen agricultural fertilizer product. Chemical industries use urea to manufacture durable resins, adhesives, and specialized diesel exhaust fluid additives. High nitrogen content makes urea an efficient and cost-effective nutrient source for crop growth. Thirty-six percent underestimates the actual calculated mass contribution of two nitrogen atoms in urea. Fifty-six percent overestimates the nitrogen mass fraction because the oxygen and carbon masses are significant. Sixty-six percent is too high given the substantial molecular weight contributions of carbon and oxygen.
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