Question

A manometer attached to flask contains with ammonia gas have no difference in mercury level initially as shown in diagram. After sparking into the flask, ammonia is partially dissociated as 2NH3(g)→N2(g)+3H2(g) now it have difference of 6 cm in mercury level in two columns, what is partial pressure of H2(g)at equilibrium?

A
6 cm Hg
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B
18 cm Hg
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C
27 cm Hg
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D
None of these
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Solution

The correct option is C None of these2NH3⟶N2+3H2internally pressure will 76 when it attains equilibrium pressure will be 76−2x⟶x,3xTotal pressure 76−2x+x+3x =76+2xwe can see that the increase in pressure of hydrogen in 76−(46+2x=2xgiven that different in mercury, the level is 6 cm⇒2x=6x=3cmPartial pressure of H2=3x =3×3 =9 cm HgSo option D is correct.

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