3 litres each of Nitrogen and Hydrogen measured at STP are allowed to react together. Find the volumes of the gases after the reaction and also the weight of Ammonia formed in the reaction.

3 litres each of Nitrogen and Hydrogen measured at STP are allowed to

1.	3 litres each of Nitrogen and Hydrogen measured at STP are allowed to react together. Find the volumes of the gases after the reaction and also the weight of Ammonia formed in the reaction.
Answer» Solution :Balanced equation is `N_(2(g))+3H_(2(g)) to 2NH_(3(g))` `"1 volt3 vol2 vol"` Ratio of VOLUMES of `N_(2), H_(2) and NH_(3)` is 1:3:2 3 litres of `H_(2)` reacts with 1 litre of `N_(2)` and forms 2 litres of `NH_(3)`. Hence volumes of `N_(2) and H_(2)` after the REACTION are 2 litres (3-1) and .0. litres RESPECTIVELY. WEIGHT of 22.4 litre of `NH_(3)` at STP =17g Weight of 2 lit of `NH_(3)` at STP `=(17 xx 2)/(22.4) =1.517gram`