  We consider a mean-field model to describe the dynamics of $N_1$ bosons of
species one and $N_2$ bosons of species two in the limit as $N_1$ and $N_2$ go
to infinity. We embed this model into Fock space and use it to describe the
time evolution of coherent states which represent two-component condensates.
Following this approach, we obtain a microscopic quantum description for the
dynamics of such systems, determined by the Schr\"{o}dinger equation.
Associated to the solution to the Schr\"{o}dinger equation, we have a reduced
density operator for one particle in the first component of the condensate and
one particle in the second component. In this paper, we estimate the difference
between this operator and the projection onto the tensor product of two
functions that are solutions of a system of equations of Hartree type. Our
results show that this difference goes to zero as $N_1$ and $N_2$ go to
infinity. Our hypotheses allow the Coulomb interaction.
