Question

One of the ingredients in the Native American stomachache remedy derived from common chokecherry is caffeic acid. Combustion of $1.00 \times 10^{2} \mathrm{mg}$ of caffeic acid yielded $220 \mathrm{mg}$ of $\mathrm{CO}_{2}$ and $40.3 \mathrm{mg}$ of $\mathrm{H}_{2} \mathrm{O}$ Determine the empirical formula of caffeic acid.

   One of the ingredients in the Native American stomachache remedy derived from common chokecherry is caffeic acid. Combustion of $1.00 \times 10^{2} \mathrm{mg}$ of caffeic acid yielded $220 \mathrm{mg}$ of $\mathrm{CO}_{2}$ and $40.3 \mathrm{mg}$ of $\mathrm{H}_{2} \mathrm{O}$ Determine the empirical formula of caffeic acid.

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Chemistry The Science in Context

Chemistry The Science in Context

Thomas R. Gilbert 5th Edition

Chapter 3, Problem 103

Instant Answer

Solved by Expert Kim Trang Nguyen

09/13/2020

Step 1

For carbon, we know that the molar mass of $\mathrm{CO}_{2}$ is approximately 44 g/mol and that there is one mole of carbon in each mole of $\mathrm{CO}_{2}$. Therefore, the mass of carbon in 220 mg of $\mathrm{CO}_{2}$ is given by: \[ \text{Mass of Carbon} = Show more…

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One of the ingredients in the Native American stomachache remedy derived from common chokecherry is caffeic acid. Combustion of $1.00 \times 10^{2} \mathrm{mg}$ of caffeic acid yielded $220 \mathrm{mg}$ of $\mathrm{CO}_{2}$ and $40.3 \mathrm{mg}$ of $\mathrm{H}_{2} \mathrm{O}$ Determine the empirical formula of caffeic acid.

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Key Concepts

Combustion Analysis

This is an analytical method used to determine the elemental composition of a compound by burning it in oxygen. The products—typically carbon dioxide and water—are measured to deduce the amounts of carbon and hydrogen contained in the original substance.

Empirical Formula Determination

This is the process of establishing the simplest whole-number ratio of the elements in a compound. The method involves converting masses from chemical analysis into moles, analyzing the ratios, and simplifying them to get the basic formula.

Stoichiometry

Stoichiometry involves calculations that relate quantities of reactants and products in chemical reactions. It is essential in combustion analysis, as it allows for converting measured masses of combustion products into moles of individual elements, which is then used to derive the empirical formula.

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