how do you determine whether or not to use avogadro's constant?

Pdav80119

2 months ago

Use Avogadro's constant (6.022 × 10²³ mol⁻¹) when:
- Converting between moles and particles (atoms, molecules, ions)
- Example: particles = moles × Avogadro's constant

Duche

2 months ago

When to Use Avogadro’s Constant
Use Avogadro’s constant (6.02 × 10²³) when the question involves number of particles.
That means:
Atoms
Molecules
Ions
Electrons
Key Idea
Avogadro’s constant links: moles number of particles
Formula: Number of particles = moles × 6.02 × 10²³
When You SHOULD Use It
Use it if the question mentions:
“number of molecules”
“number of atoms”
“number of ions”
Example: How many molecules are in 2 moles of water?
→ Use Avogadro’s constant
When You SHOULD NOT Use It
Do NOT use it if the question only involves:
Mass (grams)
Volume of gas (use 22.4 dm³ at STP)
Concentration (mol/dm³)