You analyzed 2.475 g of a mixture of NaCl, SiO₂, and CaCO,. You isolate 0.825 g NaCl, 0.825 g
of CaCO3, and 0.580 g SiO₂. You were told that the original mixture contained 35% NaCl, 45%
CaCO3, and 20% SiO₂. Report two possible sources of error.