A 5.0-liter gas tank holds 2.7 moles of monatomic helium (He) and 0.90 mole of diatomic oxygen (O2), at a temperature of 330 K. The ATOMIC masses of helium and oxygen are 4.0 g/mol and 16.0 g/mol, respectively. What is the ratio of the root-mean-square (thermal) speed of helium to that of oxygen?

This problem can be solved by using the expression

where R is the gas constant, T is absolute temperature and M is the molar mass in kg/mol. By calculating for both Helium and oxygen we have

Hence, the vrms of the monoatomic helium is two times the vrms of the oxygen

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he . if i may ask what i your question exactly?

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