A mole and a gram are different scientific units used in chemistry:
- Mole:
- A mole is a unit that measures amount of substance.
- It represents a fixed number of particles: 6.022 × 10²³ particles (Avogadro’s number).
- These particles can be atoms, molecules, or ions, depending on the substance.
- For example, 1 mole of oxygen gas (O₂) contains 6.022 × 10²³ oxygen molecules.
- Gram:
- A gram is a unit that measures mass.
- It tells you how heavy a substance is, not how many particles it contains.
- Grams are related to moles through the molar mass (the mass of 1 mole of a substance).
- For example, 1 mole of oxygen gas (O₂) has a molar mass of 32 grams, meaning 6.022 × 10²³ oxygen molecules weigh 32 g.
n short:
- A mole counts particles.
- A gram measures weight.
- The molar mass connects them (grams per mole).