Calculate the mole fraction of HCl in a 10.0% (by mass)aqueous solution.
A)0.00111
B)0.0344
C)0.0520
D)0.0548
E)0.122

Question

Quizplus · Accepted Answer

We first need to find the mass of HCl present in the solution:

Mass of HCl = 10.0 g/100 g solution = 1.0 g

We can then calculate the number of moles of HCl:

n(HCl) = 1.0 g / 36.46 g/mol = 0.0274 mol

The total mass of the solution is 100 g, so we can calculate the mass of water present:

Mass of water = 100 g - 10.0 g = 90.0 g

We can then calculate the number of moles of water:

n(H2O) = 90.0 g / 18.015 g/mol = 4.991 mol

The mole fraction of HCl is then:

X(HCl) = n(HCl) / (n(HCl) + n(H2O)) = 0.0274 mol / (0.0274 mol + 4.991 mol) = 0.0520

Therefore, the mole fraction of HCl in the solution is 0.0520.

Calculate the Mole Fraction of HCl in a 10