If 80 mL of a urea solution contains 12 g, what is the w/v percentage strength?

Rationale

15%

To calculate the weight/volume (w/v) percentage strength of a solution, the formula is (mass of solute in grams / volume of solution in mL) × 100%. In this case, with 12 g of urea in 80 mL of solution, the calculation yields a w/v percentage of 15%.

A (6.60%) YOUR ANSWER

This percentage is incorrect because it likely stems from a miscalculation. Using the formula, (12 g / 80 mL) × 100% equals 15%, not 6.60%. Therefore, this option does not reflect the correct calculation of the w/v percentage strength.

B (9.60%) YOUR ANSWER

This option is also incorrect as it does not align with the correct w/v percentage calculation. The value of 9.60% may have resulted from incorrect mathematical operations or assumptions about the relationship between mass and volume. The correct calculation, as shown, leads to 15%.

D (150%) YOUR ANSWER

A w/v percentage of 150% is impossible because it would imply that the mass of the solute exceeds the volume of the solution, which contradicts the definition of percentage strength. The calculated percentage of 15% correctly indicates that the solute's mass is significantly less than the total volume of the solution.

Conclusion

The weight/volume percentage strength of a solution indicates the proportion of solute relative to the solution's volume. In this case, the correct calculation shows that 12 g of urea in 80 mL of solution results in a w/v percentage of 15%. The other options present miscalculations or impossible values, affirming that accurate computation is essential for determining solution concentrations.

If 80 mL of a urea solution contains 12 g, what is the w/v percentage strength?

15%

Related Questions

Related Quizzes

How familiar were you with this question?

Report an Issue

Rate this Practice Test