Algonquin College Health Program Assessment (AC-HPAT) Practice Exam

True or False: Avogadro's number helps convert between moles and molecules in a sample.

1. True

2. False

3. Depends on the sample

4. Only true for gasses

The correct answer is: True

Avogadro's number, which is approximately \(6.022 \times 10^{23}\), is fundamental in chemistry because it provides a bridge between the microscopic world of atoms and molecules and the macroscopic world of grams and liters that we can measure. This number represents the quantity of particles (atoms, molecules, ions, etc.) present in one mole of a substance. When you have a given amount of substance measured in moles, you can multiply the number of moles by Avogadro's number to find the total number of molecules or particles in that amount. For example, if you have 2 moles of a substance, multiplying by Avogadro's number gives you the total number of molecules in that sample: \(2 \text{ moles} \times 6.022 \times 10^{23} \text{ molecules/mole} = 1.2044 \times 10^{24} \text{ molecules}\). This relationship holds true regardless of the state of matter—solid, liquid, or gas—making it universally applicable to any sample given in moles. Thus, it is accurate to state that Avogadro's number helps in converting between moles and molecules in a sample