Problem: An herbicide is found to contain only C, H, N, and Cl. The complete combustion of a 100.0-mg sample of the herbicide in excess oxygen produces 83.16 mL of CO2 and 73.30 mL of H2O vapor at STP. A separate analysis shows that the sample also contains 16.44 mg of Cl.Determine the percent composition of the substance.

FREE Expert Solution

The gases are at STP (standard temperature and pressure) where T = 0oC (273.15 K) and P = 1 atm. At STP, 1 mole of any ideal gas occupies 22.4 L of volume.

Knowing this information, the number of moles of each gas can be calculated:

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Problem Details

An herbicide is found to contain only C, H, N, and Cl. The complete combustion of a 100.0-mg sample of the herbicide in excess oxygen produces 83.16 mL of CO2 and 73.30 mL of H2O vapor at STP. A separate analysis shows that the sample also contains 16.44 mg of Cl.

Determine the percent composition of the substance.

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