Which of the following laboratory procedures best illustrates the law of conservation of mass? recording the rise in water level when a 25 g piece of wood is placed in 200 ml of water synthesizing 36 g of h2o plus leftover reactants by combining 4 g of h2 and 32 g of o2 heating 32 g of s and 56 g of fe to form 80 g of fes plus unused reactants measuring precisely 0.495 g of sulfur powder