# Q21: 21. At 550 K, the Kc for the following reaction is 104 mol-1 L. X(g) +Y(g) $⇌$Z(g) At equilibrium, it was observed that  $\left[\mathrm{X}\right]=\frac{1}{2}\left[\mathrm{Y}\right]=\frac{1}{2}\left[\mathrm{Z}\right]$ What is the value of [Z] ( in mol L-1) at equilibrium ? (a) 2 x 10-4          (b) 10-4               (c) 2 x 10-4         (d) 104

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