How are $0.50 \, mol$ $Na_{2}CO_{3}$ and $0.50 \, M$ $Na_{2}CO_{3}$ different?

(N/A) $0.50 \, mol$ $Na_{2}CO_{3}$ represents a specific quantity of the substance in terms of moles. The mass of $0.50 \, mol$ $Na_{2}CO_{3}$ is calculated as: $0.50 \, mol \times 106 \, g \, mol^{-1} = 53 \, g$.
$0.50 \, M$ $Na_{2}CO_{3}$ represents the molarity of the solution,which means $0.50 \, mol$ of $Na_{2}CO_{3}$ is dissolved in $1 \, L$ of the solution.
Therefore,$0.50 \, mol$ refers to the amount of substance,while $0.50 \, M$ refers to the concentration of the solution.