Mole ConceptHard

Question

A mixture of N2 and H2 is caused to react in a closed container to form NH3. The reaction ceases before either reactant has been totally consumed. At this stage, 2.0 moles each of N2, H2 and NH3 are present. The moles of N2 and H2 present originally were, respectively,

Options

A.4 and 4 moles
B.3 and 5 moles
C.3 and 4 moles
D.4 and 5 moles

Solution

N2 + 3H2 → 2NH3

a mole b mole 0

(a − x) mole (b − 3x) mole 2x mole

= 2 mole = 2 mole = 2 mole

Hence, x = 1, a = 3 and b = 5.

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