CHE 1301 Ch 3 Lecture 1 Answer to final example

CHE 1301 Ch 3 Lecture 1 Answer to final example - CHE 1301...

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CHE 1301 Ch 3 Chemical Compounds Calculating Chemical from Empirical Formula – Combustion Analysis (See also Example 3-6, pg 80 Petrucci) A 0.595 g sample of a compound containing C, H, and O is burned completely in O 2(g) to produce 1.88 g CO 2 and 0.486 g H 2 O. What is the empirical formula of the compound ? Explanation: So….. in combustion analysis we burn a compound containing C, H, and O in excess oxygen. The products are CO 2 and H 2 O, which are collected and their masses determined. All the carbon from the original sample becomes CO 2 , and all the hydrogen becomes H 2 O. We can hence find the mass of carbon and hydrogen present in the original sample, and work out percentages of these elements by mass. (Note that since we burn the sample in excess oxygen, we must find the percentage oxygen by subtracting percentages of carbon and hydrogen from 100%). Mass C present in the original sample ? Convert from mass CO 2 produced to moles of CO 2 (using molar mass of CO 2 ), then to moles of C (from the compound formula, 1 mole
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