Question

which of the following is a possible way to describe the components in the reaction below?
2ag(s) + i₂(s) → 2agi(s)
hint: all components must be of the same scale, pairing moles with moles and particles with particles.
2 atoms ag : 1 molecule i₂ : 2 formula units agi
2 moles ag : 1 molecule i₂ : 2 formula units agi
2 atoms ag : 1 mole i₂ : 2 moles agi
2 moles ag : 1 mole i₂ : 2 formula units agi

Explanation:

Step1: Analyze the units

According to the hint, all components must be of the same scale. In the first option, atoms, molecules, and formula units are all particle - level units.

Step2: Check other options

• In the second option: moles (a macroscopic amount unit) and molecule (a particle - level unit) are mixed.
• In the third option: atoms (particle - level) and moles (macroscopic) are mixed.
• In the fourth option: moles (macroscopic) and formula units (particle - level) are mixed.

Answer:

2 atoms Ag : 1 molecule \(I_{2}\) : 2 formula units AgI