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OPRA Medicinal Chemistry and Biopharmaceutics QUESTION #3824
Question 1
If $400$ mg of potassium permanganate is dissolved in $2.5$ L of water, what is the percentage concentration of the resulting solution?
  • $0.016\%$✔️
  • $0.032\%$
  • $0.064\%$
  • $0.16\%$
Correct Answer Explanation
$400\ \text{mg} = 0.4\ \text{g}$ in $2500\ \text{mL}$. Concentration $= \dfrac{0.4}{2500} \times 100 = 0.016\%\ \text{w/v}$.