# The number of moles of hydrogen molecules required to produce 20 moles of ammonia through Haber's process is: 20 30 40

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.

30

### Preparation Products

##### Knockout NEET July 2020

An exhaustive E-learning program for the complete preparation of NEET..

₹ 15999/- ₹ 6999/-
##### Rank Booster NEET 2020

This course will help student to be better prepared and study in the right direction for NEET..

₹ 9999/- ₹ 4999/-
##### Test Series NEET July 2020

Take chapter-wise, subject-wise and Complete syllabus mock tests and get in depth analysis of your test..

₹ 4999/- ₹ 2999/-
##### Knockout NEET May 2021

An exhaustive E-learning program for the complete preparation of NEET..

₹ 22999/- ₹ 11999/-