Which of the following conversion factors would be most appropriate to convert 5 grams of a substance to teaspoons?

• A. Density of the substance in g/mL and the conversion 1 teaspoon = 4.93 mL
• B. 1 liter = 1000 milliliters and 1 mole = 6.022 × 10^{23} particles
• C. Molar mass of the substance in g/mol and Avogadro's number
• D. 1 gram = 1000 milligrams and 1 teaspoon = 5 grams

Answer: (A)

Verified step by step guidance

1. Identify the units you want to convert from and to: here, you want to convert from grams (g) to teaspoons (tsp).
2. Recognize that grams measure mass, while teaspoons measure volume, so you need a conversion factor that relates mass to volume.
3. Recall that density (\( \rho \)) relates mass and volume by the formula: \( \rho = \frac{\text{mass}}{\text{volume}} \), or rearranged as \( \text{volume} = \frac{\text{mass}}{\rho} \).
4. Use the density of the substance in grams per milliliter (g/mL) to convert grams to milliliters, then use the volume conversion factor \( 1 \text{ teaspoon} = 4.93 \text{ mL} \) to convert milliliters to teaspoons.
5. Avoid using unrelated conversion factors such as molar mass, Avogadro's number, or simple mass-to-mass conversions, since they do not connect mass to volume directly.