Data and calculations mass of evaporating dish + watch glass mass of evaporating dish, watch glass + sample mass of sample determining percent of nacl in mixture: mass of evaporating dish, watch glass, and solids (after water washes) mass of nacl percent of nacl in unknown determining percent of caco3 in mixture: mass of dish, watch glass, and sio2 (final weighing) mass of caco3 percent of caco3 in unknown determining percent of sio2 in mixture: mass of sio2 percent of sio2 in unknown analysis and conclusion show your work on calculating the percentages of each component. do your percentages add up to 100.0%? if not, why? list at least two sources of error in this lab. explain what the effect on the percentage of each component would be if the student did not fully dry the evaporating dish after step 7.