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HARDMCQ SINGLEIChO (Chemistry Olympiad)Physical ChemistryChemical EquilibriumAchiever Section

N2(g) + 3H2(g) 2NH3(g) Initially the molar ratio of N2 and H2 was 1 : 3. At equilibrium, 50% of each has reacted. If the equilibrium pressure is P, the partial pressure of NH3 at equilibrium is:

A.P✓ Correct
B.P
C.P
D.P
Explanation

2 2 3 eq N 3H 2NH t 0 a 3a 0 t t a(1 ) 3a(1 ) 2a Given 50% reacted 1 2 3 NH P = (mole fraction) x (total pressure) 3 NH 1 2 × ×P P 2 P = = 1 3 α× 4 - 2× 2

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