A nitrogen-hydrogen mixture initially in the molar ratio of 1 : 3 reached equilibrium to form ammonia when 25% of the N, and H, had reacted. If the total pressure of the system was 21atm, the partial pressure of ammonia at the equilibrium was

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4.5 atm

3.0 atm

2.0 atm

1.5 atm

answer is B.

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Detailed Solution

N2(g)+3H2(g)⇌2NH3(g) t=0, 1 3 0 teq. ; 1-x 3-3x 2x given, x=1/4 PNH3 =XGas ·PTotal =0.53.5×21=3atm

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