Question 62

The final percentage strength of the drug is 6.67%.

To calculate the percentage strength of a drug solution, the formula used is (mass of solute in grams / volume of solution in mL) x 100. In this case, dissolving 33.35 grams of the drug in 500 mL of solution results in a percentage strength of 6.67%.

A) 1.77%

This option is incorrect because it does not accurately reflect the calculation of percentage strength. A percentage of 1.77% would imply that the mass of the drug is significantly lower than what has been provided in relation to the volume of the solution.

B) 3.23%

Option B is also incorrect. It suggests a lower concentration than what is actually present in the solution. The calculation shows that 33.35 grams in 500 mL yields a higher percentage than 3.23%.

C) 6.67%

This option is correct as it accurately represents the percentage strength of the drug solution. The calculation (33.35 grams / 500 mL) x 100 results in 6.67%, confirming the concentration of the drug in the solution.

D) 8.95%

Option D is incorrect because it indicates a concentration that exceeds the actual calculated strength of the solution. The amount of drug in relation to the total volume does not support a percentage strength of 8.95%.

Conclusion

The correct answer, 6.67%, is derived directly from the standard formula for calculating percentage strength of a solution. All other options fail to represent the actual concentration based on the given mass and volume, making them incorrect. Thus, the calculation confirms that 33.35 grams in 500 mL results in a concentration of 6.67%.