🧪 How to Use the Molality Calculator

The Molality Calculator helps you determine the molality of a solution based on how much solute and solvent are used.

Molality is defined as the number of moles of solute per kilogram of solvent.

✅ What You Can Do:

You can calculate molality using either:

✅ Select Compound (auto-fills molar mass), or
✅ Manually enter the molar mass

🔹 What You Need to Enter:

Select a compound from the dropdown
OR manually enter the molar mass (g/mol)
Enter the mass of solute (e.g. in g, mg, or µg)
Enter the mass of solvent (e.g. in g, mg, or kg)

⚙️ How It Works:

Once all values are provided, the calculator performs the following steps:

1. Convert all units into grams (for solute) and kilograms (for solvent)

2. Calculate moles of solute:

\[ \text{Moles of solute} = \frac{\text{Mass of solute}}{\text{Molar mass}} \]

3. Calculate molality:

\[ \text{Molality (m)} = \frac{\text{Moles of solute}}{\text{Mass of solvent (kg)}} \]

📌 Example:

Q: What is the molality of a solution containing 18 g of NaOH in 200 g of water?
✅ Select compound = NaOH
✅ Enter: Mass of solute = 18 g, Mass of solvent = 200 g

✅ Hit Calculate
💡 The calculator loads NaOH’s molar mass = 40 g/mol and computes:
Moles = 18 ÷ 40 = 0.45 mol
Solvent = 200 g = 0.2 kg
Molality = 0.45 ÷ 0.2 = 2.25 mol/kg