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Question

Nitric oxide reacts with bromine and gives nitrosyl-bromide as per reaction given below:
2NO(g)+Br2(g)2NOBr(g)
When 0.087 mole of NO and 0.0437 mole of Br2 are mixed is a closed container at constant temperature, 0.0518 mole of NOBr is obtained at equilibrium. Calculate the equilibrium amount of nitric oxide and bromine.

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Solution

2NO(g)+Br2(g)2NOBr(g)
Initial moles of NO=0.087
Initial moles of Br2=0.0437
Final moles of NO=2a
Final moles of Br2=a

number of moles of NO at equilibrium =(0.0872a)
Number of moles of Br2 at equilibrium $= (0.0437 - a)

Given:
2a=0.0518
a=0.05182=0.0259
At equilibrium,
Number of moles (amount) of NO=0.08700.0518=0.0352 mole
Number of moles (amount) of Br2=0.04370.0259=0.0178 mole

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