Here's a breakdown:
* Molarity (M): This is a unit of concentration that expresses the number of moles of solute per liter of solution.
* Sodium carbonate (Na₂CO₃): This is the chemical compound in question.
* 1 mole: This is a unit of measurement for the amount of a substance. One mole of sodium carbonate contains 6.022 x 10²³ molecules of sodium carbonate.
In simpler terms: You have one "packet" (mole) of sodium carbonate dissolved in one liter of water.
Important Note: The "1M" refers to the concentration of sodium carbonate in the solution, not the mass of the compound.