Question

If the mole fraction of sulfuric acid H2SO4 is 0.432 what is the percent by mass of H2SO4.

Answer 1

19.47%

Step-by-step explanation:

The percentage by mass of
`H_2SO_4` would be 19.47%.

The percentage by mass of a substance in solution is calculated as:

`(mass of substance)/(mass of substance + water) * 100%`

Given that the mole fraction of
`H_2SO_4` = 0.432

The total number of mole fraction of a solution = 1

Hence, mole fraction of water = 1 - 0.432 = 0.568

Mass of water = molar mass x mole

= 98.079 x 0.432 = 42.37 g

Mass of
`H_2SO_4` = molar mass x mole

= 18.02 x 0.568 = 10.24 g

Hence,

%mass of
`H_2SO_4` =
`(10.24)/(10.24 + 42.37) * 100`

= 19.47%