Calculation with gases Simplified Revision Notes for GCSE Edexcel Chemistry

Revision notes with simplified explanations to understand Calculation with gases quickly and effectively.

Learn about Le Chatelier’s Principle: Changing Concentration for your GCSE Chemistry Exam. This Revision Note includes a summary of Le Chatelier’s Principle: Changing Concentration for easy recall in your Chemistry exam

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Calculation with gases

Identify the known and unknown quantities: Start by identifying the volume of gas or number of moles you are given. Then, look for whether the question asks you to find the volume of gas or the number of moles.

Check conditions: Make sure you are working under standard room temperature (20°C) and pressure (1 atmosphere). If these conditions are met, you can use the molar volume of 24 dm³ per mole.

infoNote

Use the formula:

\text{Moles} = \frac{\text{Volume (dm³)}}{24}

To calculate volume from moles, use:

\text{Volume (dm³)} = \text{Moles} \times 24

Solve: Input the values into the relevant formula and make sure your volume is in dm³ (1 dm³ = 1000 cm³), and perform the calculation.
Final Answer: Provide the answer with the correct units, either dm³ for volume or moles for the amount of substance.

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