The value of universal gas constant is:
Correct answer: A. 8.314 Jmol-1K-1
- A. 8.314 Jmol-1K-1
- B. 8.324 Jmol-1K-1
- C. 7.23 Jmol-1K-1
- D. 1.00 Jmol-1K-1
Explanation
The correct value of the universal gas constant is 8.314 J/mol·K, which is used in the ideal gas law equation PV=nRT. This constant allows the relationship between pressure, volume, temperature, and moles of a gas to be calculated. Options B, C, and D are incorrect because they either do not match the precise value needed for accurate calculations or are significantly off. Precision is crucial when working with scientific constants.
This question appeared on the UHS MDCAT 2010 paper, which you can sit online with every answer explained.
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About Molar Specific Heat of a Gas
Molar specific heat is the heat required to raise the temperature of one mole of a gas by one kelvin, expressed through Q = nCΔT. Questions compare the constant volume value Cv with the constant pressure value Cp, apply the ideal gas relation Cp − Cv = R, and identify how the thermodynamic process affects heat capacity.
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