what is the volume at stp of .85g of ammonia

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Solution

Dear Student,

At STP, one mole of a gas occupies 22.4 L of volume.

So first, we calculate the number of moles of ammonia.
Given mass of ammonia = 0.85 g
Molar mass of ammonia = 17 g mol-1
$N u m b e r o f m o l e s = \frac{G i v e n m a s s}{M o l a r M a s s} = \frac{0.85}{17} = 0.05 N o w, o n e m o l e c o n t a i n s 22.4 L . T h e r e f o r e, 0.05 m o l e c o n t a i n s : V o l u m e o f a m m o n i a = 0.05 \times 22.4 = 1.12 L$

Hence, volume of 0.85 g of ammonia at STP is 1.12 L.

Regards

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