Question

The molality of a sulphuric acid solution in which
the mole fraction of water is 0.85 is :​

Answer 1

Answer:

Explanation:

If the mole fraction of water is 0.85, the mole fraction of sulfuric acid is 0.15.

So, we can express the concentration as

0.15 mol sulfuric acid

0.85 mol water

Convert moles of water to kilograms of water

Mass of water

=

0.85

mol H

2

O

×

18.02

g H

2

O

1

mol H

2

O

×

1

kg H

2

O

1000

g H

2

O

=

0.0153 kg H

2

O

Calculate the molal concentration of the water

b

=

0.15 mol sulfuric acid

0.0153 kg water

=

9.8 mol/kg