Concentrated sulfuric acid is 18.0 M and has a density of 1.84 g/mL.Calculate the percent mass of sulfuric acid in concentrated H₂SO₄.

Question

Quizplus · Accepted Answer

The molecular formula for sulfuric acid is H2SO4, which has a molar mass of 98.08 g/mol.

To calculate the mass percent of sulfuric acid in the solution, we need to first find the mass of sulfuric acid in one liter of the solution using the molarity and density given:

Volume of 1 L of solution = 1000 mL
Mass of 1 L of solution = volume x density = 1000 mL x 1.84 g/mL = 1840 g

To calculate the moles of sulfuric acid in 1 L of solution, we can use the molarity:

Moles of H2SO4 in 1 L of solution = 18.0 mol/L x 1 L = 18.0 mol

From here, we can calculate the mass of sulfuric acid in 1 L of solution:

Mass of H2SO4 in 1 L of solution = moles x molar mass = 18.0 mol x 98.08 g/mol = 1765.44 g

Finally, we can calculate the mass percent of sulfuric acid in the solution:

mass percent H2SO4 = (mass of H2SO4 / mass of solution) x 100%
mass percent H2SO4 = (1765.44 g / 1840 g) x 100%
mass percent H2SO4 = 96.0%

Therefore, the correct answer is D.

Concentrated Sulfuric Acid Is 18