An aqueous LiNO₂ solution is made using 90.3 g LiNO₂ and diluting it to a total volume of 1.72 L. If the density of the solution is 1.20 g/mL, what is the mass percent of the solution?

• A. 4.37%
• B. 5.25%
• C. 4.19%
• D. 4.99%

Answer: (A)

Verified step by step guidance

1. Calculate the mass of the solution using its volume and density. Convert the volume from liters to milliliters by multiplying by 1000, then multiply by the density to find the mass of the solution in grams.
2. Determine the mass of the solute, LiNO2, which is given as 90.3 g.
3. Use the formula for mass percent: \( \text{Mass percent} = \left( \frac{\text{mass of solute}}{\text{mass of solution}} \right) \times 100 \% \).
4. Substitute the mass of the solute and the mass of the solution into the formula to calculate the mass percent.
5. Compare the calculated mass percent with the given options to identify the correct answer.