1- Use the half-reaction method to balance the equation Ca(s) +Cl2(g) --> CaCl2(s).
2-A sample of sodium chloride, NaCl, weighing 0.0678 g is placed in a 25.0-mL volumetric flask. Enough water is added to dissolve the NaCl, and then the flask is filled to the mark with water and carefully shaken to mix the contents. What is the molarity of the resulting solution?