What is the value of the ideal gas constant (R) in the ideal gas equation?

JAMB Chemistry 2023 63 views

What is the value of the ideal gas constant (R) in the ideal gas equation?

  1. 8.31 JK⁻¹mol⁻¹ or 0.082 atmdm³K⁻¹mol⁻¹ ✓
  2. 0.0921 atm·L/mol·K or 0.0921 atmdm³K⁻¹mol⁻¹
  3. 2.987 cal/mol·K or 2.987 atmdm³K⁻¹mol⁻¹
  4. 27.414 L/mol or 27.414 atmdm³K⁻¹mol⁻¹

Explanation

The ideal gas constant R has the value 8.31 J/(K·mol) in SI units or 0.082 atm·L/(K·mol) in other common units. The value depends on which units you use for pressure and volume.

R appears in the ideal gas equation PV = nRT, connecting pressure, volume, temperature, and number of moles. This constant is the same for all ideal gases.

Different unit systems require different R values, but they all represent the same physical constant. Choose the R value that matches your pressure and volume units.

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