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A spherical balloon of volume 4.00 xx 10...

A spherical balloon of volume `4.00 xx 10^(3) cm^(3)` contains helium at a pressure of `1.20 xx 10^(5) Pa`. How many moles of helium are in the balloon if the average kinetic energy of the helium atoms is `3.60 xx 10^(-22) J`?

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