Question detail

What is the value of the gas constant R in the ideal gas equation when using pressure in kPa?

Try the question, check the answer, then read the explanation to understand the curriculum point.

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At a glance

MCQ

Type

practice

Style

Topic

Amount of substance

Question

A. 8.31 J/(mol·K)
B. 0.0821 L·atm/(mol·K)
C. 8.314 kPa·dm³/(mol·K)
D. 0.08314 kPa·L/(mol·K)

Answer

8.314 kPa·dm³/(mol·K)

Explanation

The gas constant R has different values depending on the units used. When pressure is in kPa and volume in dm³, R is 8.314 kPa·dm³/(mol·K). This consistency is necessary for accurate calculations.

Common mistake

Incorrect Rearrangement of Ideal Gas Equation

Students often incorrectly rearrange the ideal gas equation pV = nRT, leading to wrong calculations of pressure, volume, or temperature.

To correctly rearrange the ideal gas equation, identify the variable you need to isolate. For example, to find volume (V), use V = nRT/p. Substitute the known values into the equation, perform the calculations, and ensure your final answer includes the correct units (dm³ for volume).

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