Which of the following concentration factors can be calculated if the mole fraction and density of an aqueous solution of `HCl` are known ?

Options

A. Molality
B. Molarity
C. Percent by mass
D. Normality

Explanation

To determine which concentration factors can be calculated from the mole fraction and density of an aqueous solution of HCl, we will analyze each concentration factor step by step.

### Step 1: Understanding Mole Fraction
The mole fraction of a solute (HCl in this case) is defined as:
\[ \text{Mole Fraction of HCl} (X_{HCl}) = \frac{n_{HCl}}{n_{HCl} + n_{H_2O}} \]
Where \( n_{HCl} \) is the number of moles of HCl and \( n_{H_2O} \) is the number of moles of water.
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