Question

A solution of H2SO4 (90.08 g/mol) has 785.6 g of H2SO4 and 359 g of H2O. What is the molal concentration (molality)?

Answer 1

The molality of H₂SO₄ solution is 24.2 m.

Step-by-step explanation:

We need to find the molality of sulfuric acid.

Mass of sulfuric acid = 785.6 g

Mass of water = 359 g

We have to find the moles of H₂SO₄ by using its mass and molar mass as,

Moles of H₂SO₄ =
`$(785.6g)/(90.08 g/mol)`

= 8.7 moles

Mass of the solution in kg =
`$(359)/(1000)` = 0.359 kg

Molality =
`$(moles)/(solvent (kg))`

=
`$(8.7 mol )/(0.359 kg)\\`

= 24.2 m

So molality of the H₂SO₄ solution is 24.2 m.