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Gas Volume (RTP) Calculator

Volume of gas at room temperature and pressure.

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Volume

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Overview

This equation relates the volume of a gas to the amount of substance in moles at Room Temperature and Pressure (RTP). It is derived from Avogadro's Law, which states that one mole of any gas occupies approximately 24 dm³ under these specific conditions.

Symbols

Variables

V = Volume, n = Moles

Volume
Moles
mol

Apply it well

When To Use

When to use: Apply this formula when working with gases at a temperature of approximately 20°C and a pressure of 1 atmosphere. It is specifically used for calculations involving the molar volume of a gas in decimeters cubed (dm³).

Why it matters: This calculation is vital for industrial stoichiometry, allowing chemists to predict the volume of gaseous products or reactants. It simplifies complex gas laws into a single constant for practical laboratory work.

Avoid these traps

Common Mistakes

  • Using constant 22.4 (STP) instead of 24 (RTP).
  • Unit mismatch.

One free problem

Practice Problem

A sample contains 0.5 moles of Carbon Dioxide gas at RTP. Calculate the volume of the gas in dm³.

Moles0.5 mol

Solve for:

Hint: Multiply the number of moles by the molar volume constant of 24 dm³/mol.

The full worked solution stays in the interactive walkthrough.

References

Sources

  1. IUPAC Gold Book: Molar volume
  2. Wikipedia: Molar volume
  3. Atkins' Physical Chemistry
  4. IUPAC Gold Book: Standard ambient temperature and pressure (SATP)
  5. AQA GCSE Chemistry Student Book
  6. IUPAC Gold Book
  7. Pearson Edexcel GCSE (9-1) Chemistry
  8. OCR GCSE Chemistry — Quantitative Chemistry