Lard, Lye and Salt are combined to make Glycerin (a sweet tasting substance found in lotion) and Soap. This process makes some left-over material as a waste product. If 30.0 kg of lard, 20.0 kg of lye and 5.0 kg of salt are combined and 25.0 kg of glycerin, and 5.0 kg of waste are produced, what mass of soap is made? Show all work. also Explain How it demonstrates the law of conservation of mass