A student obtains the following data A. Mass of evaporating dish. 21.345g B. Mass of evaporating dish and saturated NaCl solution. 42.817 g C. Mass of dish and NaCl after evaporation. N n n 38.915g Report the Mass of '/, of NaCl in this solution. Write the number as a percentage with the correct number of significant figures as shown (i.e. .25 '/,) there should be no space between the numbers and sign