TIMED PLS HELP ASAP The Alka-Seltzer experiment produced 0.000208 moles of carbon dioxide. What is the mass of NaHCO3 present in the sample?

If the mass of the products measured 120g what would the mass of the reactants a. 30g b. 60g c. 120g d. 240g

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

Can someone me with 1 to 4 plz. fast