We are asked to calculate the mass of nitrogen is present in the sample.

Calculate the partial pressure of nitrogen:

$\overline{){{\mathbf{P}}}_{{\mathbf{T}}}{\mathbf{}}{\mathbf{=}}{{\mathbf{P}}}_{{\mathbf{Ar}}}{\mathbf{}}{\mathbf{+}}{\mathbf{}}{{\mathbf{P}}}_{{\mathbf{N}}_{\mathbf{2}}}}\phantom{\rule{0ex}{0ex}}\mathbf{}{\mathbf{P}}_{{\mathbf{N}}_{\mathbf{2}}}\mathbf{}\mathbf{}\mathbf{=}\mathbf{}{\mathbf{P}}_{\mathbf{T}}\mathbf{}\mathbf{-}\mathbf{}{\mathbf{P}}_{\mathbf{Ar}}\phantom{\rule{0ex}{0ex}}\mathbf{}{\mathbf{P}}_{{\mathbf{N}}_{\mathbf{2}}}\mathbf{}\mathbf{}\mathbf{=}\mathbf{}\mathbf{725}\mathbf{}\mathbf{mmHg}\mathbf{}\mathbf{-}\mathbf{}\mathbf{231}\mathbf{}\mathbf{mmHg}\phantom{\rule{0ex}{0ex}}\mathbf{}{\mathbf{P}}_{{\mathbf{N}}_{\mathbf{2}}}\mathbf{}\mathbf{}\mathbf{=}\mathbf{}\mathbf{494}\mathbf{}\mathbf{mmHg}$

A 275 mL gas sample contains argon and nitrogen at a temperature of 65 ^{o}C. The total pressure of the sample is 725 mmHg and the partial pressure of argon is 231 mmHg.

What mass of nitrogen is present in the sample?

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