A mixture of 1.374 g of H 2 and 70.31 g of Br 2 is heated together in a 2.00-L v

Question

A mixture of 1.374 g of H2 and 70.31 g of Br2is heated together in a 2.00-L vessel at 700K. These substancesreact as follows: H2(g) + Br2(g) D 2 HBr(g). At equilibrium, the vessel is found tocontain 0.566 g of H2. What is the numerical value ofKc at 700K?

Explanation / Answer

                     H2+           Br2->           2HBr at t=0(moles): 1.374/2         70.31/160              0 at t:   0.687-x           0.4394-x              2x Given 0.687-x = 0.566/2=0.283 => x=0.404 Kc = (2x/V)^2/(0.4394-x)/V(0.687-x)/V =4x^2/(0.4394-x)(0.687-x) using x= 0.404 Kc =65.16

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