Which one is the right value for R ?
Correct answer: A. 0.0821 atm dm3k-1mol-
- A. 0.0821 atm dm3k-1mol-
- B. 0.0821 atm m3k-1mol-1
- C. 2 cal k-1 mol-1
- D. 8.314 Nm2k-1mol-1
Explanation
The gas constant can be written as R = 0.0821 L atm K^-1 mol^-1, equivalent to 0.0821 dm3 atm K^-1 mol^-1, so option a has the intended value and units despite the formatting error. The likely mistake is option d, but N m2 is not the correct pressure-volume unit for R; the SI form is 8.314 J K^-1 mol^-1 or 8.314 N m 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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