Fertilisers help

I don't have an answer book to my chemistry revision book, so can anyone give me the answer to any of these questions so I can correct my work?

1) Why is the Haber process carried out at a moderately high temperature and why is the yield of ammonia not 100%?

2) Why do the pipes used in the Haber process in the catalytic converter have thick walls?

3) Shown below are stages in the manufacture of nitric acid:
A + oxygen --> nitrogen dioxide --> nitric acid

a) Why is nitrogen dioxide not made from nitrogen?
b) Name gas A.

4a) Which reactant for the ammonia plant is produced in the reaction between methane and water?
b) Name the process that converts ammonia into nitrogen dioxide.

Thanks

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I don't have an answer book to my chemistry revision book, so can anyone give me the answer to any of these questions so I can correct my work?

1) Why is the Haber process carried out at a moderately high temperature and why is the yield of ammonia not 100%?

My answers

1) If too high, the products change back to reactants. If temp' is too low, the reaction is too slow.

2) Why do the pipes used in the Haber process in the catalytic converter have thick walls?

My answers

2) So that no gas escapes

3) Shown below are stages in the manufacture of nitric acid:
A + oxygen --> nitrogen dioxide --> nitric acid

a) Why is nitrogen dioxide not made from nitrogen?


My answers

3a) oxygen is also needed

b) Name gas A.

My answers
b) nitrogen

4a) Which reactant for the ammonia plant is produced in the reaction between methane and water?

My answers
4a) methanol

b) Name the process that converts ammonia into nitrogen dioxide

b) Ostwald process

You have not addressed the 100%. You should add that the reaction is an equilibrium.

To withstand the high pressure used. (250 atmospheres)


Nitrogen does not react directly with oxygen except under extreme circumstances such as electric discharge.



Pretty poor answer given that they told you that it wasn't nitrogen in part a) !!!

The gas is ammonia



Your choice of reactants for the ammonia plant are nitrogen and hydrogen!



OK