Sulfuric acid is listed in a catalog with a concentration of 95–98%. A bottle of the acid in the stockroom states that 1.00 L has a mass of 1.84 kg. To determine the concentration of sulfuric acid in the stockroom bottle, a student dilutes 5.00 mL to 500. mL. She then takes four 10.00-mL samples and titrates each with standardized sodium hydroxide (c = 0.1760 M).

(a) What is the average concentration of the diluted sulfuric acid sample?
(b) What is the mass percent of H₂SO₄ in the original bottle of the acid?

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Sample Volume NaOH (mL) 1 2 20.15 3 21.30 20.40 4 20.35