1. What is the Number of Moles Formula from Volume?

Definition: This calculator determines the amount of substance (in moles) based on the volume of gas and its molar volume.

Purpose: It helps chemistry students and professionals quickly convert between volume and moles for gaseous substances.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( n \) — Number of moles (mol)
• \( V \) — Volume of gas (dm³)
• \( V_m \) — Molar volume (dm³/mol, typically 22.4 at STP)

Explanation: The gas volume is divided by its molar volume to determine the number of moles of substance present.

3. Importance of Moles Calculation

Details: Moles are fundamental in chemical calculations for stoichiometry, reaction yields, and gas law applications.

4. Using the Calculator

Tips: Enter the gas volume in dm³ and molar volume (default 22.4 dm³/mol at STP). All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What is standard molar volume?
A: At STP (0°C and 1 atm), 1 mole of any ideal gas occupies 22.4 dm³ (22.4 L).

Q2: When would molar volume differ from 22.4 dm³/mol?
A: At different temperatures/pressures (use ideal gas law) or for non-ideal gases.

Q3: Can this be used for liquids or solids?
A: No, this formula is specifically for gases. For liquids/solids, you'd need density and molar mass.

Q4: How precise is this calculation?
A: It's exact for ideal gases at specified conditions. Real gases may show slight deviations.

Q5: What if my volume is in liters?
A: 1 dm³ = 1 L, so you can enter liters directly without conversion.