A nitrogen-hydrogen mixture initially in the moler ratio of `1:3` reached equilibrium to from ammonia when 25% of the `N_(2)and N_(2)` had reacterd .If the pressure of the system was 21 atm , the partial pressure of ammonia at the equilibrium was :
A
`4.5 atm`
B
`3.0`atm
C
`2.0`atm`
D
`1.5atm`
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The correct Answer is:
b
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