A Seizure of Heroin Is Analyzed to Obtain the %Purity

question 6

Multiple Choice

A seizure of heroin is analyzed to obtain the %purity of the drug. An intermediate calculation involves the weight of the sample which is recorded at 75.54 mg. The balance uncertainty is 0.31 mg.
What is the relative uncertainty of the sample weight reported to two significant digits?

• A) 0.0024
• B) 243.7
• C) 0.4
• D) 0.0041
• E) None of the above

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