A Cubic Box with Sides of 20

question 4

Multiple Choice

A cubic box with sides of 20.0 cm contains 2.00 × 10²³ molecules of helium with a root-mean-square speed (thermal speed) of 200 m/s.The mass of a helium molecule is 3.40 × 10^-27 kg.What is the average pressure exerted by the molecules on the walls of the container? The Boltzmann constant is 1.38 × 10^-23 J/K and the ideal gas constant is
R = 8.314 J/mol ∙ K = 0.0821 L ∙ atm/mol ∙ K.

• A)3.39 kPa
• B)1.13 kPa
• C)570 Pa
• D)2.26 kPa
• E)9.10 Pa

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