Molarity Practice Problems

Vinyl acetate (C₄H₆O₂) is commonly used in producing industrial chemicals. A 20.0 g sample of C₄H₆O₂ is dissolved in 70.0 grams of water. The solution obtained has a density of 0.982 g/mL. Determine the molarity of the solution.

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.

The overall concentration of creatinine (C₄H₇N₃O) in urine was carefully approximated as 5.92 mM. Calculate the amount (in g) of creatinine present in 10.0 mL of a urine sample collected during an annual check-up. 

If 20.0 g of NaOH has been weighed out, what is the volume (in milliliters) of 12.5% (m/v) solution that can be prepared? How many milliliters of 0.225 M NaOH solution can be prepared from the same mass of NaOH?

Potassium thiosulfate (K₂S₂O₃) solution, a fertilizer applied to a wide variety of crops, reacts with silver chloride according to the reaction below.

AgCl (s) + 2 K₂S₂O₃ (aq) → K₃Ag(S₂O₃)₂ (aq) + KCl (aq)

Calculate the volume of 0.0125 M K₂S₂O₃ that contains 1.75×10⁻³ mol K₂S₂O₃.

A chemist added 375 mL of 4.2 x 10^-3 mM silver(II) oxide, AgO, solution to a flask. Determine the mass in micrograms of AgO the chemist has added to the flask. Express your answer to 2 sig figs.

A calcium bromide solution contains 185 mmol of calcium bromide (CaBr₂). If the concentration of the solution is 2.85 mol/L, calculate the volume of the solution in milliliters. Answer in the correct number of significant figures.

Commercial grade HCl solutions usually have a concentration of 31.0% by mass HCl in water. If the solution has a density of 1.20 g/mL, calculate the molarity of the HCl solution.

What is the molarity of a nitric acid solution that was prepared by mixing 75.00 mL of 0.150 M HNO₃ and 125.00 mL of 0.250 M HNO₃?