$\mathbf{mass}\mathbf{}\mathbf{Ar}\mathbf{=}\mathbf{339}\mathbf{.}\mathbf{855}\mathbf{}\mathbf{g}\mathbf{-}\mathbf{337}\mathbf{.}\mathbf{426}\mathbf{g}\mathbf{=}$**2.329 g**

$\mathbf{mass}\mathbf{}\mathbf{of}\mathbf{}\mathbf{mixture}\mathbf{=}\mathbf{339}\mathbf{.}\mathbf{076}\mathbf{}\mathbf{g}\mathbf{-}\mathbf{337}\mathbf{.}\mathbf{426}\mathbf{g}\mathbf{=}$**1.65 g**

$\mathbf{mass}\mathbf{}\mathbf{Ne}\mathbf{=}\mathbf{2}\mathbf{.}\mathbf{329}\mathbf{}\mathbf{g}\mathbf{-}\mathbf{1}\mathbf{.}\mathbf{65}\mathbf{}\mathbf{g}\mathbf{=}$**0.679 g**

A glass vessel fitted with a stopcock has a mass of 337.426 g when evacuated. When filled with Ar, it has a mass of 339.855 g. When evacuated and refilled with a mixture of Ne and Ar, under the same conditions of temperature and pressure, it weighs 339.076 g.

What is the mole percent of Ne in the gas mixture?

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