#1. A salt crystal has a mass 0.14mg,How many NaCl formula units does it contain? Express your answer using two significant figures. #2. How to write sodium carbonate and lead (II) nitrate as a complete ionic equation and as a net ionic equation?
To get the number of formula units given 0.14 mg NaCl. We convert first the mass to moles by dividing by the molar mass, then multiplying by Avogadro's number. The final answer is 1.44 x 10^18 formula units.
