What is the value of the gas constant R?

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Study for the IMAT Chemistry Exam. Access flashcards and multiple choice questions; hints and explanations included for each question. Prepare effectively for your exam.

Multiple Choice

What is the value of the gas constant R?

Explanation:
R is the universal gas constant that links pressure, volume, temperature, and amount in the ideal gas law PV = nRT. In SI units, its value is 8.314 J/(mol·K), which is the energy per mole per kelvin. Because 1 J equals 1 Pa·m^3, you can also express it as 8.314 Pa·m^3/(mol·K) or 8.314 L·kPa/(mol·K). Rounded for simplicity, it is commonly taken as 8.31 J/(mol·K). The correct value is not 0.00831 J/(mol·K) (that's off by a factor of 1000), nor 8.31 kJ/(mol·K) (off by a factor of 1000 in the other direction), nor 83.1 J/(mol·K) (off by a factor of about 10).

R is the universal gas constant that links pressure, volume, temperature, and amount in the ideal gas law PV = nRT. In SI units, its value is 8.314 J/(mol·K), which is the energy per mole per kelvin. Because 1 J equals 1 Pa·m^3, you can also express it as 8.314 Pa·m^3/(mol·K) or 8.314 L·kPa/(mol·K). Rounded for simplicity, it is commonly taken as 8.31 J/(mol·K).

The correct value is not 0.00831 J/(mol·K) (that's off by a factor of 1000), nor 8.31 kJ/(mol·K) (off by a factor of 1000 in the other direction), nor 83.1 J/(mol·K) (off by a factor of about 10).

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