Feed to a vacuum crystallizer contains 82% urea, o.5% biuret and 17.5% water by weight. In the crystallizer, 50% water is evaporated at 50 °C at which temperature the solubility of urea is 205 g per...

Answer and explain how.

Extracted text: Feed to a vacuum crystallizer contains 82% urea, o.5% biuret and 17.5% water by weight. In the crystallizer, 50% water is evaporated at 50 °C 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.