Under standard thermodynamic conditions, what are the standard temperature and pressure?

Study for the CIE Chemistry Advanced Subsidiary (AS) Level Test. Prepare with multiple-choice questions and detailed explanations. Master the exam!

Multiple Choice

Under standard thermodynamic conditions, what are the standard temperature and pressure?

Explanation:
Standard conditions in thermodynamics are defined as a temperature of 298 K (25°C) and a pressure of 1 atm. This pair is used as a reference state for many tabulated gas properties and reactions, so that quantities like standard molar volumes or standard enthalpies are comparable. At 298 K and 1 atm, an ideal gas would have a molar volume of about 24.5 L per mole (Vm ≈ RT/P). The choice that lists 298 K with 1 atm matches this widely used convention. Other options pair different temperatures with these or near values: 0 K is absolute zero and unattainable; 273 K is 0°C (an older convention for standard state in some texts); 1 bar (100 kPa) is close but not the standard 1 atm definition.

Standard conditions in thermodynamics are defined as a temperature of 298 K (25°C) and a pressure of 1 atm. This pair is used as a reference state for many tabulated gas properties and reactions, so that quantities like standard molar volumes or standard enthalpies are comparable.

At 298 K and 1 atm, an ideal gas would have a molar volume of about 24.5 L per mole (Vm ≈ RT/P). The choice that lists 298 K with 1 atm matches this widely used convention. Other options pair different temperatures with these or near values: 0 K is absolute zero and unattainable; 273 K is 0°C (an older convention for standard state in some texts); 1 bar (100 kPa) is close but not the standard 1 atm definition.

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