1.7g of a gas occupies 2.24 litres at s.t.p. What is the molecular weight of the gas?

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Solution

$1 m o l e o f a n y g a s o c c u p i e s 22.4 L 1 m o l e = M o l a r m a s s o f t h e g a s T h a t m e a n s 22.4 L o f t h e g a s i s o c c u p i e d b y m o l a r m a s s . 2.24 L h a s 1.7 g 22.4 L = \frac{1.7}{2.24} \times 22.4 = 17 g t h u s t h e m o l a r m a s s o f t h e g a s i s 17 g a n d i t m a y b e N H_{3}$

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