Complex sentence: If the gold-silver solution was assumed to behave ideally, it would be expected the diffusivities would also be equivalent, and therefore the overall diffusion coefficient of the system would be the average each components diffusivity; however, this was found not to be true.
Split into simpler sentences: If the gold-silver solution is assumed to behave ideally, it would be expected the diffusivities would also be equivalent. Therefore, the overall diffusion coefficient of the system would be the average each components diffusivity; however, this was found not to be true.