Calculate the number of moles in $112 \mathrm{g}$ of iron. 

$\left[\mathrm{Atomic} \mathrm{mass} \mathrm{of} \mathrm{Fe}=56 \mathrm{u}, \mathrm{C}=12 \mathrm{u}, \mathrm{H}=1\mathrm{u}, \mathrm{O}=16\mathrm{u}\right]$

Calculate the mass of $0.5$ mole of sugar$\left[{\mathrm{C}}_{12}{\mathrm{H}}_{22}{\mathrm{O}}_{11}\right]$.

$\left[\mathrm{Atomic} \mathrm{mass} \mathrm{of} \mathrm{Fe}=56 \mathrm{u}, \mathrm{C}=12 \mathrm{u}, \mathrm{H}=1\mathrm{u}, \mathrm{O}=16\mathrm{u}\right]$

Define the following term.

Atom

Define the following term

Molecule

Define the following term

Avogadro's number

Define the following term

Molar mass