Which of the following laboratory procedures best illustrates the law of conservation of mass? A) Recording the rise in water level when a 25g piece of wood is placed in 200mL of water
B) synthesizing 36g of h20 by combining 4g of H2 and 32g of O2
C) Heating 32g of S and 56g of Fe to form 80g of FeS
D) Measuring precisely .495g of sulfur powder
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