Gas Volume Gauntlet

The Gas Volume Gauntlet ☁️

Gases are hard to weigh, but easy to measure by **volume**. Chemists use one powerful fact to switch between the amount of a gas and the space it fills. At **room temperature and pressure (RTP)**, one mole of **any** gas takes up the same volume: **24 dm3**. In this gauntlet you will use that number to calculate gas volumes and amounts.

The words of the gauntlet 🔑

The key ideas for gas-volume calculations:

One number to rule them all 💡

At RTP, **one mole of any gas occupies 24 dm3** (24,000 cm3). It does not matter whether it is hydrogen, oxygen or carbon dioxide: one mole always fills 24 dm3. This is the **molar volume**, and it is the key to every calculation in this module.

The magic number ⚗️

What volume does one mole of any gas occupy at room temperature and pressure?

• 24 dm3
• 12 dm3
• 1 dm3
• 48 dm3

From moles to volume 🔢

An interactive activity.

From volume to moles ➗

An interactive activity.

The rule in words 🧱

At room temperature and pressure, one _____ of any gas occupies _____ dm3. To find the volume of a gas, _____ the number of moles by 24. To find the number of moles, _____ the volume by 24. This works because equal volumes of gases contain equal numbers of _____.

Both directions ↔️

The molar volume works both ways. Which way you travel depends on what you are given.

Mass to volume, step by step 🪜

An interactive activity.

A gas from a reaction 🧪

An interactive activity.

Avogadro's law ⚖️

Avogadro's law describes gases at the same temperature and pressure. Select the TWO statements that are TRUE.

• Equal volumes of different gases contain equal numbers of molecules
• The volumes of gases in a reaction are in the same ratio as the balanced equation
• Equal volumes of different gases always have equal mass
• A heavier gas always takes up more volume per mole

Run the gauntlet 🧮

An interactive activity.

Show your working ✍️

An interactive activity.