What information in a balanced chemical equation shows how many moles of a reactant are involved in the reaction?

At stp, what is the volume of 1 mole of co2?

Nonmetal halogen family atmoic mass 35

You are making a solution of calcium chloride dissolved in water. you add solid, stir, and it dissolves. you add just a spatula tip full, stir, and the solid does not dissolve. how could you describe the solutions before and after adding the spatula tip amount