The number of moles of hydrogen molecules required to produce 20 moles of ammonia through Haber's process is:

 

20

 

 

30

 

40

 

Answers (2)

 

Mole Concept -

One mole is the amount of a substance that contains as many particles or entities as there are atoms in exactly 12 g (or 0.012 kg) of the 12C isotope.

- wherein

one mole = 6.0221367 X 1023   

 

 

 

Law of multiple proportion -

If two elements can combine to form more than one compund, the masses of one element that combines with a fixed mass of other element are in ratio of small whole numbers.

- wherein

H_{2} + \frac{1}{2}O_{2}\rightarrow H_{2}O

2g        16g          18g

H_{2} +O_{2}\rightarrow H_{2}O_{2}

2g        32g        34g

masses of oxygen combining with a fixed mass of hydrogen have ratio 16:32 => 1:2

 

 

Law of conservation of mass -

Matter can neither be created nor destroyed.

- wherein

H_{2} + \frac{1}{2}O_{2}\rightarrow H_{2}O

2g        16g            18g

Mass is balanced on both sides

 

 

The reaction is:

N_2 + H_2 \longrightarrow NH_3

For 20 moles of ammonia, the balanced equation is:

10N_2 + 30H_2 \longrightarrow 20NH_3

\therefore 30 moles of H2 are required.

\therefore Option 3 is correct.

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