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Chemical Formulae

Two moles of ...

Question

Two moles of N2 and two moles of H2 are taken in a closed vessel of 5 litres capacity and suitable conditions are provided for the reaction . When the equilibrium is reached it is found that a half mole of N2is used up. What is the equilibrium concentration of NH3?

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Solution

N₂(g) +3H₂(g) →2NH₃(g)

Given Initially , amount of N₂ = 2 moles
amount of H₂ = 2 moles

When equillibrium is reached,
Amount of N₂ used = 0.5 moles

Thus according to the balanced chemical reaction

1 mole of N₂ on reaction will produce = 2 moles of NH₃
Thus 0.5 mole of N₂ on reaction will produce = 2 ×0.5 moles of NH₃= 1 mole of NH₃

Thus at equillibrium 1 mol of NH₃ will be present.

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