For a homogeneous gaseous reaction 2 A(g)+3 B(g)4C(g)+D(g)Keq=8(1.5)3. If in a 2 litre rigid container starting with 4 moles of A and 6 moles of B equilibrium was established then identify the options which is / are correct.

  1. A

    Concentration of B at equilibrium is 1.5 M

  2. B

    Concentration of D at equilibrium is 1 M

  3. C

    Concentration of A at equilibrium is 1 M

  4. D

    Concentration of C at equilibrium is  2 M

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    Solution:

     

    2 A(g)4 moles4 - 2x+ 3 B(g)6 moles6 -3x  4C(g)V=2 litre 4x+ D(g) x   Keq=8(1.5)3 Keq=(4x)4x(4-2x)2(6-3x)3×1V4×1V1V2×1V3 8(1.5)3=44x54(2-x)227(2-x)3 8×4×27(1.5)3(4)4=x2-x5x2-x5=1 x2-x=1x=1 [B]eq=6-3xV=6-32=32=1.5M [D]eq =xV=12=0.5M [A]eq=4-2xV=22=1M [C]eq=4xV=4×12=2M

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