1. What is Pmol to Ng Conversion?

The pmol to ng conversion is used to convert between molar amount (picomoles) and mass (nanograms) of a substance, given its molecular weight. This is commonly needed in biochemistry and molecular biology experiments.

2. How Does the Calculator Work?

The calculator uses the following formula:

Where:

• \( pmol \) — Amount in picomoles (10⁻¹² moles)
• \( MW \) — Molecular weight in grams per mole (g/mol)
• \( ng \) — Result in nanograms (10⁻⁹ grams)

Explanation: The formula converts between the number of molecules (pmol) and their mass (ng) using the substance's molecular weight as the conversion factor.

3. Importance of the Conversion

Details: This conversion is essential when preparing solutions where concentration is specified in molar units but measurements are made by mass, or vice versa.

4. Using the Calculator

Tips: Enter the amount in picomoles and the molecular weight in g/mol. Both values must be positive numbers. The result will be displayed in nanograms.

5. Frequently Asked Questions (FAQ)

Q1: Why divide by 1000 in the formula?
A: The division by 1000 converts from picograms (result of pmol × MW) to nanograms (1 ng = 1000 pg).

Q2: How do I find the molecular weight?
A: Molecular weight can be found in chemical databases, product specifications, or calculated by summing atomic weights of all atoms in the molecule.

Q3: Can I use this for proteins?
A: Yes, use the protein's molecular weight (often listed in kDa - convert to g/mol by multiplying by 1000).

Q4: What's the difference between pmol and ng?
A: Pmol measures number of molecules, while ng measures mass. The conversion requires knowing the molecular weight.

Q5: Can I convert ng back to pmol?
A: Yes, use the inverse formula: \( pmol = \frac{ng \times 1000}{MW} \)