Question

5 lit of nitrogen on combining with 15 lit of hydrogen will produce lit of ammonia ​

Answer 1

Answer:

If approximately 15 liters of hydrogen combine with nitrogen to produce ammonia, what is the volume of ammonia in litres formed?

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Hydrogen and nitrogen reacting to form ammonia is a reversible reaction, so it depends on the reaction conditions.

If you look at the stoichiometry of the reaction, you can see that 1 mole of nitrogen gas reacts with 3 moles of hydrogen gas to form 2 moles of ammonia gas.

N2 + 3H2 → 2NH3

Using Le Chatelier's principle, increasing the pressure of the system would increase yield of ammonia as there are fewer moles of gas on the right side. Also if you increase the temperature (as the enthalpy change in the forward direction is negative, so it is exothermic) you decrease the yield. This is typically balanced against the rate of reaction - which increases with temperature - in industry.

If theoretically you managed to get 100% yield and 15 litres of hydrogen, you'd need 5 litres of nitrogen to obtain 10 litres of ammonia. This is because a litre of gas has roughly the same amount of molecules regardless of the type of molecule when you keep the pressure and temperature the same (pV = nRT, ideal gas equation if you want to look into it).