Which of the following is the correct conversion factor to convert millimoles (mmol) to moles (mol)?

• A. 1 mol / 1 mmol
• B. 1000 mol / 1 mmol
• C. 1 mol / 1000 mmol
• D. 1 mmol / 1 mol

Answer: (C)

Verified step by step guidance

1. Understand the relationship between moles and millimoles: 1 mole (mol) is equal to 1000 millimoles (mmol).
2. Write this relationship as an equality: \(1\ \text{mol} = 1000\ \text{mmol}\).
3. To convert from millimoles to moles, set up a conversion factor that cancels out millimoles and leaves moles.
4. Since you want to convert mmol to mol, place moles in the numerator and millimoles in the denominator: \(\frac{1\ \text{mol}}{1000\ \text{mmol}}\).
5. This conversion factor means you multiply the number of millimoles by \(\frac{1\ \text{mol}}{1000\ \text{mmol}}\) to get the amount in moles.