What is the molar mass of sodium sulfate (Na2SO4)?

• A. 98.08 g/mol
• B. 120.06 g/mol
• C. 156.10 g/mol
• D. 142.04 g/mol

Answer: (D)

Verified step by step guidance

1. Identify the chemical formula of sodium sulfate, which is \(\mathrm{Na_2SO_4}\).
2. Determine the atomic masses of each element from the periodic table: sodium (Na), sulfur (S), and oxygen (O).
3. Calculate the total mass contributed by each element by multiplying the atomic mass by the number of atoms in the formula: \$2 \times \mathrm{Na}\(, \)1 \times \mathrm{S}\(, and \)4 \times \mathrm{O}$.
4. Add the masses of all elements together to find the molar mass of sodium sulfate: \(\text{Molar mass} = 2 \times M_{\mathrm{Na}} + 1 \times M_{\mathrm{S}} + 4 \times M_{\mathrm{O}}\).
5. Sum these values to get the final molar mass in grams per mole (g/mol).