A chemistry student conducted several different procedures. Which of the following procedures best demonstrates the law of conservation of mass?
using filter paper to separate 2 grams of solid powder from 10 grams of water
burning 2 kilograms of wood from a pine tree leaves 0.4 kilogram of ash and soot
evaporating sugar water leaves 5 grams of sugar and turns the water into water vapor
combining 2 grams of copper and 4 grams of sulfur to make 6 grams of copper sulfate
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