How many moles are in 2g of H2O
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1/9 moles

Explanation:

No of moles = mass/molar mass

No of moles = 2g/18gmol-1

No of moles = 1/9 moles

the reaction mixture contains some ammonia, plus a lot of unreacted nitrogen and hydrogen. the mixture is cooled and compressed, causing the ammonia gas to condense into a liquid. the liquefied ammonia is separated and removed. the unreacted nitrogen and hydrogen are then recycled back into the reactor .