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S o l u t i o n : ​ ​ ​ ​ ​ ​ ​ d e n s i t y o f g a s (d) = \frac{P M}{R T} w h e r e P = P r e s s u r e o f g a s, M = g r a m m o l e c u l a r m a s s, T = T e m p e r a t u r e . = 273 ° C = (273 + 273) K = 546 K 3 g . L^{- 1} = \frac{\frac{1140 m m H g}{\frac{760 m m H g}{a t m}} \times M}{0.0821 l . a t m . m o l^{- 1} . K^{- 1} \times 546 K} \Rightarrow M = 89.6 g / m o l T h u s, g r a m m o l e c u l a r m a s s o f g a s i s 89.6 g / m o l

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