Conservation of mass Original Scenario-Based Practice

Questions

1. 1.

   Inside the hermetically sealed crystal crucible of an orbital botanical laboratory, an astrochemist combines 42.0 g of a blue liquid nutrient with 16.0 g of an active enzyme extract. The mixture undergoes a rapid chemical reaction accompanied by an intense violet glow, leaving behind a porous purple solid and an odorless vapor trapped inside the vessel. Assuming no matter enters or escapes the sealed crucible, what is the combined mass of the resulting purple solid and vapor?

   • A) Less than 58.0 g, because part of the original matter was lost as radiant light during the reaction.
   • B) Exactly 58.0 g, because the total mass of the products must equal the total mass of the reactants in a closed system.
   • C) Greater than 58.0 g, because the formation of a solid precipitate increases the total amount of matter present.
   • D) Exactly 42.0 g, because only the liquid nutrient contributes measurable mass to the resulting solid phase.

Answers and step-by-step solutions appear after you finish the test.