STP Gas Calculator

Convert between gas volume, moles, mass, and particles at standard temperature and pressure (STP)

Enter any three values to calculate the fourth. STP is defined as 0°C (273.15 K) and 1 atm.

STP Gas Calculator Examples

See how to use the calculator with real gases.

Oxygen Gas (O₂) - Find Mass

Oxygen

Calculate the mass of 44.8 L O₂ at STP (molar mass 32.00 g/mol).

Gas Volume (L): 44.8 L

Moles (mol): 2 mol

Mass (g): g

Molar Mass (g/mol): 32.00 g/mol

Particles (molecules): 1.2044e24 molecules

Nitrogen Gas (N₂) - Find Volume

Nitrogen

Calculate the volume of 56 g N₂ at STP (molar mass 28.02 g/mol).

Gas Volume (L): L

Moles (mol): 2 mol

Mass (g): 56 g

Molar Mass (g/mol): 28.02 g/mol

Particles (molecules): 1.2044e24 molecules

CO₂ - Find Particles

Carbon Dioxide

Calculate the number of molecules in 22.414 L CO₂ at STP (molar mass 44.01 g/mol).

Gas Volume (L): 22.414 L

Moles (mol): 1 mol

Mass (g): 44.01 g

Molar Mass (g/mol): 44.01 g/mol

Particles (molecules): molecules

Hydrogen Gas (H₂) - Find Moles

Hydrogen

Calculate the moles in 36.6 g H₂ at STP (molar mass 2.016 g/mol).

Gas Volume (L): L

Moles (mol): mol

Mass (g): 36.6 g

Molar Mass (g/mol): 2.016 g/mol

Particles (molecules): 1.092e25 molecules

Other Titles
Understanding the STP Gas Calculator: A Comprehensive Guide
Master gas conversions at standard temperature and pressure.

What is STP and Why is it Important?

  • Definition of STP
  • Role in Chemistry
  • Standardization Benefits
STP stands for Standard Temperature and Pressure, defined as 0°C (273.15 K) and 1 atm. It is a reference point for gas calculations in chemistry.
STP in Laboratory and Industry

STP in Practice

  • Calculating the volume of 1 mol of any ideal gas at STP.
  • Comparing gas properties under standard conditions.

Step-by-Step Guide to Using the STP Gas Calculator

  • Input Requirements
  • Calculation Process
  • Interpreting Results
To use the calculator, enter any three of the following: gas volume, moles, mass, molar mass, or particles. Leave one field blank to calculate it automatically.
Example: Finding Mass from Volume and Molar Mass

Step-by-Step Examples

  • 44.8 L O₂, 2 mol, 32.00 g/mol → 64 g mass.
  • 56 g N₂, 28.02 g/mol, 2 mol → 44.8 L volume.

Real-World Applications of STP Calculations

  • Academic Uses
  • Industrial Applications
  • Research and Development
STP calculations are essential in academic settings, industrial gas production, and scientific research. They ensure consistency and comparability of results.
STP in Industry

Applications

  • Determining the amount of gas needed for a chemical reaction.
  • Calculating gas yields in manufacturing.

Common Misconceptions and Correct Methods

  • Ideal vs. Real Gases
  • STP vs. SATP
  • Unit Conversions
Many confuse STP (0°C, 1 atm) with SATP (25°C, 1 atm). Also, real gases may deviate from ideal behavior at high pressure or low temperature.
Avoiding Calculation Errors

Misconceptions

  • Using the correct molar volume: 22.414 L/mol at STP.
  • Checking units before calculation.

Mathematical Derivation and Examples

  • Ideal Gas Law
  • Avogadro's Law
  • Sample Calculations
The ideal gas law (PV = nRT) and Avogadro's law (1 mol = 22.414 L at STP) form the basis of these calculations. Use Avogadro's number (6.022e23) for particles.
Worked Example: CO₂ at STP

Mathematical Examples

  • 22.414 L CO₂, 1 mol, 44.01 g/mol → 44.01 g, 6.022e23 molecules.
  • 36.6 g H₂, 2.016 g/mol → 18.15 mol, 406.6 L at STP.