Which of the following is the correct conversion of 0.25 mg to mL, assuming the density of the substance is 1.00 g/mL?

• A. 0.00025 mL
• B. 2.5 mL
• C. 0.25 mL
• D. 0.025 mL

Answer: (A)

Verified step by step guidance

1. Identify the given information: mass = 0.25 mg and density = 1.00 g/mL. Note that density relates mass and volume by the formula \(\text{density} = \frac{\text{mass}}{\text{volume}}\).
2. Convert the mass from milligrams (mg) to grams (g) because the density is given in g/mL. Use the conversion factor \$1\ \text{g} = 1000\ \text{mg}\(, so \)0.25\ \text{mg} = 0.25 \times 10^{-3}\ \text{g}$.
3. Rearrange the density formula to solve for volume: \(\text{volume} = \frac{\text{mass}}{\text{density}}\).
4. Substitute the converted mass and the given density into the volume formula: \(\text{volume} = \frac{0.25 \times 10^{-3}\ \text{g}}{1.00\ \text{g/mL}}\).
5. Calculate the volume in mL by performing the division, which will give the volume corresponding to 0.25 mg of the substance with the given density.