Feed to a vacuum crystallizer contains 82% urea, 0.5% biuret and 17.5% water by weight. In the crystallizer, 50% water is evaporated at 50 0C at which temperature the solubility of urea is 205 g per 100 g water. If the mother liquor is found to contain 1.6% biuret, find the yield of urea crystals and its biuret content.

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