The SI unit of R in General Gas equation is:
Correct answer: A. 8.3143 JK⁻¹mol⁻¹
- A. 8.3143 JK⁻¹mol⁻¹
- B. 0.0821 dm³atom mol⁻¹K⁻¹
- C. 8.3143 Jmol⁻¹
- D. 0.0821 dm³tor K⁻¹mol⁻¹
Explanation
The SI unit of R (the ideal gas constant) in the General Gas equation (PV = nRT) is 8.3143 J K⁻¹ mol⁻¹ (Joules per Kelvin per mole). Here's how we derive this: Ideal Gas Equation: PV = nRT P = pressure (Pascals, Pa or N/m²) V = volume (cubic meters, m³) n = number of moles (mol) R = ideal gas constant T = temperature (Kelvin, K) Rearranging the equation to solve for R:R = PV / nT Now, let's look at the units: Pressure (P): Pa = N/m² = kg⋅m⁻¹⋅s⁻² Volume (V): m³ Number of moles (n): mol Temperature (T): K So the units of R are:(kg⋅m⁻¹⋅s⁻²)⋅m³ / (mol⋅K) = kg⋅m²⋅s⁻²⋅K⁻¹⋅mol⁻¹Since 1 Joule (J) is equal to 1 kg⋅m²⋅s⁻², the SI units of R can also be written as:J⋅K⁻¹⋅mol⁻¹ or J/(K⋅mol)The value of R is approximately 8.314 J K⁻¹ mol⁻¹.
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About Ideal Gas Equation
The ideal gas equation, PV = nRT, relates pressure, volume, amount and absolute temperature when gas particles are assumed to have negligible volume and no intermolecular forces. Applications include finding molar mass, density or an unknown gas variable, with careful use of Kelvin temperature and consistent units, and comparison with real-gas behaviour.
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