Calculate the mole fraction of HCl in a 9.45% (by mass)aqueous solution.
A)0.0491
B)0.0516
C)0.0981
D)0.0245
E)The density of the solution is needed to solve the problem.

Question

Quizplus · Accepted Answer

The mole fraction of HCl can be calculated using the formula:Mole fraction of HCl = (moles of HCl) / (total moles of solution)To calculate the moles of HCl, we need to know the mass of HCl in the solution. We can calculate the mass of HCl using the percentage by mass:Mass of HCl = 9.45% * 100 g = 9.45 gTo convert the mass of HCl to moles, we need to divide by the molar mass of HCl:Moles of HCl = 9.45 g / 36.46 g/mol = 0.259 molTo calculate the total moles of solution, we need to know the mass of the solution. We can assume that the density of the solution is 1 g/mL, so the mass of the solution is 100 g.Total moles of solution = 100 g / 18.02 g/mol = 5.54 molNow we can calculate the mole fraction of HCl:Mole fraction of HCl = 0.259 mol / 5.54 mol = 0.0491Therefore, the correct answer is A) 0.0491.

Calculate the Mole Fraction of HCl in a 9