## Question

###### (a) How many atoms of helium gas fill a balloon of diameter $30.0 mathrm{~cm}$ at $20.0^{circ} mathrm{C}$ and $1.00 mathrm{~atm}$ ?(b) What is the average kinetic energy of the helium atoms? (c) What is the root-mean-square speed of the helium atoms?

(a) How many atoms of helium gas fill a balloon of diameter $30.0 mathrm{~cm}$ at $20.0^{circ} mathrm{C}$ and $1.00 mathrm{~atm}$ ? (b) What is the average kinetic energy of the helium atoms? (c) What is the root-mean-square speed of the helium atoms?

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