An empty beaker has a mass of 60 grams. When mercury is added to the beaker, it has a mass of 200 grams. What is the mass of the mercury? *

140 grams

Explanation:

200g total mass - 60g beaker = 140g

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every chemical equation adheres to the law of conservation of mass, which states that matter cannot be created or destroyed. therefore, there must be the same number of atoms of each element on each side of a chemical equation.