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A manometer attached to a flask contains...

A manometer attached to a 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 `2NH_(3)" (g)"rarr N_(2)" (g)"+3H_(2)" (g)"` now it have difference of 6 cm in mercury level in two columns, what is partial pressure of `H_(2)" (g)"` at equilibrium?

A

9 cm Hg

B

18 cm Hg

C

27 cm Hg

D

None of these

Text Solution

Verified by Experts

The correct Answer is:
a
(a) `{:((a),2NH_(3)(g),to,N_(2)(g), +, 3H_(2)(g)),("Before sparking"," "76 ,, " " 0,, 0),("After sparking", 76-2x,," "x,,3x),("at eqm",,,,,):}`
Increase in pressure `2x=6, x=3cm Hg`
Partial pressure of `H_(2)=3xx3=9cmHg`
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