In 1000 ml of water was dissolved 5 mol of sulfuric acid. Calculate the mass fraction of the acid in the solution.

Let’s find the molar mass of sulfuric acid.

M H2SO4 = 2 + 32 + 16 x 4 = 98 grams / mol;

Find the mass of 5 mol of sulfuric acid.

m H2SO4 = 5 x 98 = 490 grams;

The solution consists of two components: water weighing 1000 grams and acid weighing 490 grams.

The mass of the solution is equal to the sum of their masses:

m solution = 1,000 + 490 = 1,490 grams.

To find the mass fraction of the acid, divide the mass of the acid by the mass of the solution:

C = m acid / m solution = 490/1490 = 0.3289 = 32.89%;