Eduqas A-Level Chemistry Revision
Explore Eduqas A-Level Chemistry revision topics. Check the official specification for complete requirements for your exam year and route.
Course details
Assessment For assessment details, see the official specification.
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Reviewed course guidance
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Topic group
Reviewed requirements
- Core
Scope: Core · AS Chemistry, C1.3 Chemical calculations, point (i): ideal gas equation pV = nRT
Open revision guidance
What to know
- For an ideal gas, pV = nRT. Use pressure in Pa, volume in m³, amount n in mol, temperature in K, and the gas constant R in matching SI units (8.31 J mol⁻¹ K⁻¹). Rearrange the equation for the unknown and convert units before substitution.
What to do in an assessment
- Convert °C to K by adding 273.15; convert kPa to Pa and dm³ to m³ if using SI values. Check that the rearranged answer’s units match the physical quantity.
In plain language
The ideal-gas equation links pressure, volume, amount and absolute temperature.
Self-check
Find the pressure of 0.100 mol gas at 298 K in 2.49 dm³. Use R = 8.31 J mol⁻¹ K⁻¹.
Show the answer
V = 2.49×10⁻³ m³. p = nRT/V = 0.100×8.31×298/(2.49×10⁻³) ≈ 9.95×10⁴ Pa = 99.5 kPa.
Earlier topic checklist
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Chemistry topic list
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