Question

can anyone do it for me plz

Answer 1

HELLO THERE!

The reaction stated in the question is Haber's Process of preparation of ammonia, in which 4 moles of reactants give 2 moles of product.

Now, let's check out your questions:

1) State why [+Δ] indication is seen after NH₃.

Actually, Δ sign represents HEAT. The above reaction is highly exothermic, i.e., heat is evolved during the reaction.

Hence, the +Δ sign is used after ammonia (product) to show that heat is also evolved in the reaction besides formation of the product.

2) State what 200 atmospheres indicates.

The reaction is clearly an irreversible reaction, i.e., there are chances of re-formation of nitrogen and hydrogen from ammonia, which defeats the purpose of our reaction. Hence, for maintaining forward reaction, we need to maintain a very high pressure.

Atmospheres is a unit of pressure, and 200 atmospheres denote the pressure maintained in the reaction. Actually the range of pressure is 200-900 atmospheres.

3) State the function of Fe in the reaction.

Here, dusted Iron (Fe) acts as a catalyst, which increases the rate of the reaction and maintains the spontanity (if you don't know what is spontanity, you will study it in higher classes in Chemical Thermodynamics).

Molybdenum is used as a promoter, which increases the efficiency of the catalyst.

HOPE MY ANSWER IS SATISFACTORY...

THANKS!