Final answer:
To find the mass of 3.49 moles of NaCl, multiply the molar mass of NaCl (58.5 g/mol) by the number of moles, yielding a mass of 204.015 grams.
Step-by-step explanation:
To calculate the mass in grams of 3.49 moles of sodium chloride, you need to know the molar mass of sodium chloride (NaCl). The molar mass is the sum of the atomic masses of sodium (Na) and chlorine (Cl). For Na, the atomic mass is 23.0 u, and for Cl, it is 35.5 u. Therefore, the molar mass of NaCl is 58.5 g/mol.
Once you have the molar mass, you multiply it by the number of moles to get the mass in grams:
- Molar mass of NaCl = 23.0 g (for Na) + 35.5 g (for Cl) = 58.5 g/mol.
- Mass of NaCl = Number of moles × Molar mass = 3.49 moles × 58.5 g/mol.
- Therefore, the mass of 3.49 moles of NaCl = 204.015 grams.