An Analyst Performs a LC-HRMS Scan of an Extract of Post-Mortem

question 31

Multiple Choice

An analyst performs a LC-HRMS scan of an extract of post-mortem blood. The sample contains fentanyl, which is used to calculate the mass accuracy of the instrument. The exact mass is 336.2202 Da. The analysis produces a measured mass of 336.2189 Da. What is the mass accuracy in ppm?

• A) 3.9
• B) -3.9
• C) -2.6
• D) 2.6
• E) none of the above

---

Definitions:

Income Statement

A financial document that provides an overview of a company's performance over a specific period, detailing revenues, expenses, and net earnings.

Net Operating Income

An indicator of a firm's earnings generated from its principal business activities, not accounting for interest and tax deductions.

Variable Costing

An accounting method that includes only variable production costs in product costs, excluding fixed overhead.

Absorption Costing

An accounting strategy that considers every manufacturing expense, including direct materials, direct labor, and overhead costs (both variable and fixed), in determining a product’s cost.