Question

A spherical balloon of volume 3.90 x 103 cm3 contains helium at a pressure of 1.15 x 105 Pa. How many moles of helium are in the balloon if the average kinetic energy of the helium atoms is 3.60 x 10-22 J? mol
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Answer #1

Using ideal gas law,

where n is the number of moles and T is temperature in Kelvin.

now Average kinetic energy per molecule at temperature T is,

Where k is Boltzman cost.

So,

So putting this value in,

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