Question

What is the molarity of $HCl$ in a solution prepared by dissolving 5.5 g $HCl$ in 200 g ethanol if the density of the solution is 0.79 g/ mL?

• A. 0.58 M
• B. 0.21 M
• C. 0.93 M
• D. 1.7 M

Answer 1

Answer: (A)

0.58 M

Molarity = $\frac{givenweight\ast density}{molecularweight\ast massofsolution}\ast 1000$

Mass of solution = $5.5+200$ g

Molarity = $\frac{5.5\ast 0.79}{36.5\ast 205.5}\ast 1000$

Molarity - 0.58 M