Question

9 during an experiment, zinc and sulfur chemically react to form zinc sulfide. according to the law of conservation of mass, which is the correct equation for this experiment? a zn + s → zns b 3zn + 2s → 3zns c zn + 2s → 2zns d 2zn + 3s → 5zns

Explanation:

Step1: Check the law of conservation of mass

The law of conservation of mass states that the number of atoms of each element on the reactant side must be equal to the number of atoms of each element on the product side.
For option A:

• On the reactant side: 1 Zn atom and 1 S atom.
• On the product side: 1 Zn atom and 1 S atom.

For option B:

• On the reactant side: 3 Zn atoms and 2 S atoms.
• On the product side: 3 Zn atoms and 3 S atoms. Atoms of S are not balanced.

For option C:

• On the reactant side: 1 Zn atom and 2 S atoms.
• On the product side: 2 Zn atoms and 2 S atoms. Atoms of Zn are not balanced.

For option D:

• On the reactant side: 2 Zn atoms and 3 S atoms.
• On the product side: 5 Zn atoms and 5 S atoms. Atoms of Zn and S are not balanced.

Answer:

A. \(Zn + S
ightarrow ZnS\)