i dont know what to do

Question

a 1.35 L solution of Sulfuric Acid is 18.15 M. It has a density of 1.84g/mL. Calculate the % by mass of this solution

Answer 1

To find % by mass, we need to know the mass of H₂SO₄ and the total mass of the solution. From the 18.15 M and the fact that we have 1.35 L, and the knowing the molar mass of H2SO4 = 98.1 g/mol, we can find the mass of H₂SO₄:

18.15 moles / L x 1.35 L x 98.1 g/mol = 2404 g H₂SO₄

From the density, we can find the mass of the entire solution:

1.35 L x 1000 ml / L x 1.84 g / ml = 2484 g

% by mass = mass H₂SO₄ / total mass (x100%) = 2404 g / 2484 g (x100%) = 96.8% H₂SO₄