Problem: Hydrogen sulfide is composed of two elements: hydrogen and sulfur. In an experiment, 6.700 g of hydrogen sulfide is fully decomposed into its elements.What fundamental law does this experiment demonstrate?

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We’re being asked to determine the fundamental law involved in the demonstrated experiment.


Recall the modern atomic theory that states that matter is composed of small, indivisible particles called atoms. The basis of this theory are the following fundamental laws.

  • The Law of Conservation of Mass states that matter can neither be created nor destroyed, all that happens is that it changes forms.
  • The Law of Definite Proportions states that no matter where you obtain a compound, whether it’s from a lab experiment or from the collection out in the field, the ratio of elements in it will remain constant.
  • The Law of Multiple Proportions states that when element A and element B combine they can form different compounds in different ratios to one another. Dividing these different ratios should generate a whole number answer.


Given: Hydrogen sulfide is composed of two elements: hydrogen and sulfur. In an experiment, 6.700 g of hydrogen sulfide is fully decomposed into its elements.

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Hydrogen sulfide is composed of two elements: hydrogen and sulfur. In an experiment, 6.700 g of hydrogen sulfide is fully decomposed into its elements.

What fundamental law does this experiment demonstrate?