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A mixture of NH(3)( g) and N(2) H(4)(g) ...

A mixture of `NH_(3)( g)` and `N_(2) H_(4)(g)` is placed in a sealed vessel at `27^(@)C` . The total pressure of the gas is 0.5 atm. The vessel is heated to `927^(@)C` where the following decomposition reaction take place `:`
`N_(2) H_(4) rarr N_(2)(g) + 2H_(2)(g)`
`2NH_(3)(g) rarr N_(2)(g) + 3H_(2) ( g)`
The pressure in the vessel at this stage becomes 4.5 atm. The mole percent of `NH_(3)(g)` in the original mixture was `:`

A

0.25

B

0.6

C

0.75

D

0.8

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The correct Answer is:
C
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