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- ReginaldLv 78 years agoFavorite Answer
At STP, gases have a molar volume of 22.414 liters; that is, one mole of any gas

occupies 22.414 liters at STP.

The molecular weight of ammonia (NH3) is 17.03, so 1 mole of ammonia has a

mass of 17.03 grams.

So at STP, 17.03 grams of gaseous ammonia occupy 22.414 liters, so one liter

has a mass of 17.03/22.414, or 0.7598 gram.

So the density of ammonia at STP is 0.7598 gram per liter.

Source(s): college chemistry

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