GOB Chemistry
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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?