Student can convert between mass, moles, and number of particles using the Avogadro constant.
Introduce the SI unit for amount of substance and Avogadro's constant.
Atoms and molecules are incredibly small, making it impossible to count them one by one. To handle such massive numbers, chemists use a convenient unit of measurement called the mole.
Just as we use the word "dozen" to mean exactly 12 items, or a "score" for 20 items, a mole simply means a specific, very large number of particles.
Visualizing different substances having the same number of particles but different masses.
One mole of different substances varies greatly in mass and volume, but always contains exactly 6.022 × 10²³ particles.
Write out Avogadro's number to show its scale.
Define molar mass and formula relation.
The molar mass (mass of one mole in grams) is numerically equal to the atomic, molecular, or formula mass in unified mass units ().
Exercise 1.33: Number of atoms in different quantities.
Use the following references to solve:
List the known quantities and units provided for all three parts.
Identify the formula or logic you will use for each part.
Substitute the known values into your formulas.
Show the arithmetic to solve for the final number of atoms.
State your final answers clearly with correct scientific notation.
Do the magnitudes make sense based on the units given?