Which of the following is the molar mass of Na_2CO_3 (sodium carbonate)?

• A. 58 g/mol
• B. 84 g/mol
• C. 106 g/mol
• D. 180 g/mol

Answer: (C)

Verified step by step guidance

1. Identify the chemical formula of sodium carbonate, which is \(\mathrm{Na_2CO_3}\).
2. Determine the atomic masses of each element from the periodic table: sodium (Na), carbon (C), 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{C}\(, and \)3 \times \mathrm{O}$.
4. Add the masses of all elements together to find the molar mass of \(\mathrm{Na_2CO_3}\) using the formula: \(\mathrm{Molar\ mass} = 2 \times M_{Na} + 1 \times M_C + 3 \times M_O\).
5. Compare the calculated molar mass with the given options to identify the correct molar mass.