-->

Equilibrium

Question
CBSEENCH11006423

Nitric oxide reacts with Br2 and gives nitrosyl bromide as per reaction given below:
                                2 NO left parenthesis straight g right parenthesis space plus space Br subscript 2 left parenthesis straight g right parenthesis space rightwards harpoon over leftwards harpoon space space space 2 NOBr left parenthesis straight g right parenthesis
When 0.087 mol of NO and 0.0437 mol of Br2 are mixed in a closed container at constant temperature, 0.0518 mol of NOBr is obtained at equilibrium. Calculate equilibrium amount of NO and Br2.

Solution
The given reversible reaction is
                    2 NO left parenthesis straight g right parenthesis space plus space Br subscript 2 left parenthesis straight g right parenthesis space space rightwards harpoon over leftwards harpoon space space space space 2 NO space Br left parenthesis straight g right parenthesis
2 mol of NO reacts with 1 mol of Br2 to form 2 mol NOBr, 0.0518 mol of NOBr would be formed by reaction of 0.0518 mol of NO and fraction numerator 0.0518 over denominator 2 end fraction space mol space of space Br subscript 2.
space space therefore space space space At space equilibrium colon
space space space Amount space of space NO space left space unreacted space equals space 0.087 minus 0.0518 space
space space space space space equals space 0.0352 space mol
space space space Amount space of space Br subscript 2 space left space unreacted space equals space 0.0437 minus fraction numerator 0.0518 over denominator 2 end fraction
space space space space space equals 0.0178 space mol