A Cubic Box with Sides of 20 Cm Contains 2

question 11

Multiple Choice

A cubic box with sides of 20 cm contains 2 × 10²³ molecules of helium with a root-mean-square (rms) speed of 200 m/s. The mass of a helium molecule is 3.4 × 10^-27 kg. What is the average pressure exerted by the molecules on the walls of the container?

• A)3.39 kPa
• B)1.13 kPa
• C)570 Pa
• D)2.26 kPa
• E)9.1 Pa

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