A 5.0­liter gas tank holds 1.7 moles of monatomic helium (He) and 1.10 mole of diatomic oxygen (O2), at a temperature of 260 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? a. 2.8 b. 2.0 c. 1.4 d. 4.0

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