Determining Mass and Moles of Sodium Chloride

What is the mass and moles of sodium chloride used/made?

1) 0.73 g, 0.0125 moles

2) 2.12 g, 0.0362 moles

3) 0.73 g, 0.00869 moles

4) 2.12 g, 0.0252 moles

Final Answer:

The mass of sodium chloride used/made is 1.39 g and the moles of sodium chloride is approximately 0.0238 moles.

Explanation: To determine the mass and moles of sodium chloride used/made, we need to calculate the difference in mass between the dry evaporating dish, watch glass, and NaHCO3 (61.64 g) and the dry evaporating dish, watch glass, and residue (NaCl) (60.25 g). The difference in mass is 1.39 g, which is the mass of sodium chloride formed.

To find the moles of sodium chloride, we can divide the mass by the molar mass of NaCl, which is 58.4 g/mol. Dividing 1.39 g by 58.4 g/mol gives us approximately 0.0238 moles of sodium chloride.