Final answer:
The formula weight of sodium carbonate is approximately 105.99 amu.
Step-by-step explanation:
The formula weight of sodium carbonate (Na2CO3) can be calculated by summing the atomic masses of its constituent elements. The atomic mass of sodium (Na) is approximately 22.99 amu, the atomic mass of carbon (C) is approximately 12.01 amu, and the atomic mass of oxygen (O) is approximately 16.00 amu. Sodium carbonate contains two sodium atoms, one carbon atom, and three oxygen atoms.
To calculate the formula weight, multiply the atomic masses by the number of atoms and sum them:
(2 * 22.99) + 12.01 + (3 * 16.00) = 105.99 amu
Therefore, the formula weight of sodium carbonate is approximately 105.99 amu.