Find the molarity of a 40.0 % by mass aqueous solution of sulphuric acid H2SO4 for which the density is 1.3057 g/ml

5.33 mol/L.

Explanation:

Its density is 1.3057 g/ml so in a liter (1000 mL) there is 1305.7 g of solution, but only 40% is sulfuric acid.

0.40x1305.7=522.28

So in a liter of 40% sulfuric acid solution there is 522.28 g of sulfuric acid.

Sulfuric acid molar mass iss 98.079 g/mol, so in 522.28 g of sulfuric acid there is

522.28 g / 98.079 g/mol=5.33 mol

In one liter of solution there is 5.33 mol of sulfuric acid, so the molarity of such solution is 5.33 mol/L.