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azibur3191
azibur3191
18.05.2021 • 
Chemistry

Forensic chemists working for Chem Lab Burns, Inc. often work with police to help identify unknown materials found at crime scenes. Many compounds have the same chemical formula, but with different structures. The lab starts with a combustion analysis to help find the formula of the unknown material submitted to the lab. The following is the combustion analysis result for a liquid found at a recent veterinary clinic break-in. Chem Lab Burns, Inc.

Combustion Analysis
23 - June - 2019

Sample ID: R0103

Element Percent of Sample
carbon 58.5
hydrogen 7.31
nitrogen 34.1

Values Accurate to ±0.1%

Knowing the molecular formula for the compound, a chemist can consult a list to see what chemicals share that molecular formula. One of the chemicals that corresponds with this molecular formula is 4-methylpyrazole, which is used as a treatment for ethylene glycol poisoning. Ethylene glycol is the main ingredient in automobile antifreeze and is sweet in taste, but deadly to mammals. Dogs sometimes lick spilled antifreeze from a garage floor and become very ill or die. At the veterinarian’s office, a sample of 4-methylpyrazole can be administered at a concentration of 1.5 g/1.5 mL. What is the molarity of this solution of 4-methylpyrazole?
A. 0.082M
B. 3.5M
C. 9.2M
D. 12M

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