In a chemical laboratory, a task was assigned to analyze the molarity of picric acid (C₆H₃N₃O₇) solution, a Hager's reagent for detecting alkaloids. In an empty evaporating dish weighing 29.5 g, a 20.0 mL sample of C₆H₃N₃O₇ solution is placed. The total mass of the evaporating dish containing the C₆H₃N₃O₇ solution is 49.7 grams. The C₆H₃N₃O₇ solution placed in the evaporating dish is dried in an oven. After drying, a total mass of 29.7 grams is obtained for the evaporating dish and the anhydrous C₆H₃N₃O₇. Determine the molarity of the C₆H₃N₃O₇ solution.

• A. 0.0436 M
• B. 0.0873 M
• C. 0.0634 M
• D. 0.0387 M

Answer: (A)