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The law of conservation of matter says that the mass of the reactants will equal the mass of the products. In the case of making soap, the general reaction is fat + sodium hydroxide -->soap + glycerin. In this example, the mass of the reactants is 890 g + 115 g = 1005 g. The mass of the products is x grams of soap + 90 g glycerin. Since the mass of the products has to be the same as the mass of the reactants (1005g), one can figure out the mass of the soap. It will be 1005 g - 90 g = 915 g of soap.

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Q: When making soap if 890 g of a specific fat react completely with 115 g of sodium hydroxide the products formed are soap and 90 g of glycerin. Calculate the mass of soap formed to satisfy the law of c?
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