Answer:
120 g NaCl
General Formulas and Concepts:
- Reading a Periodic Table
- Dimensional Analysis (DA)
- Writing compounds
Explanation:
Step 1: Define
2.1 moles NaCl (sodium chloride)
Step 2: Define conversions
Molar Mass of Na - 22.99 g/mol
Molar Mass of Cl - 35.45 g/mol
Molar Mass of NaCl - 22.99 + 35.45 = 58.44 g/mol
Step 3: Convert (DA)
[tex]2.1 \ mol \ NaCl(\frac{55.84 \ g \ NaCl}{1 \ mol \ NaCl} )[/tex] = 122.724 g NaCl
- mol NaCl and mol NaCl cancel out
- left with g NaCl as final units
Step 4: Check
We have 2 sig figs. Follow sig fig rules.
122.724 g NaCl ≈ 120 g NaCl
