CG PET Internal Energy — practice questions

Explore 2 free Internal Energy questions in CG PET Physics. Open each question or exercise to read its content, reference answers and available explanation.

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Internal Energy questions and exercises with answers

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An ideal gas is held in a container at temperature T. The total internal energy of one mole of a monatomic gas is:Read the answer and worked solution →The internal energy of 2 moles of nitrogen gas (rigid diatomic) at 300 K is approximately ($R = 8.314$):Read the answer and worked solution →

Worked practice questions

An ideal gas is held in a container at temperature T. The total internal energy of one mole of a monatomic gas is:

$\frac{3}{2} RT$
$\frac{5}{2} RT$
$\frac{7}{2} RT$
$RT$

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Correct answer: A. $\frac{3}{2} RT$

**Monatomic:** 3 translational DOF. U = (3/2)RT per mole. **For diatomic (rigid):** (5/2)RT polyatomic with vibrations: (7/2)RT+.

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The internal energy of 2 moles of nitrogen gas (rigid diatomic) at 300 K is approximately ($R = 8.314$):

~ 1247 J
~ 6240 J
~ 12480 J
~ 25000 J

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Correct answer: C. ~ 12480 J

U = $n \cdot (5/2)RT = 2 \cdot (5/2)(8.314)(300) = 5 \cdot 8.314 \cdot 300 \cdot 2 / 2 = 12471$ J ≈ 12480 J.