21. What is the molar mass of potassium carbonate K_(2)CO_(3) 67g/mol 106g/mol 99g/mol 138g/mol

To calculate the molar mass of potassium carbonate, , we need to sum the molar masses of all the atoms in the compound:1. Potassium (K): The atomic mass of potassium is approximately . Since there are two potassium atoms, the total mass contributed by potassium is: 2. Carbon (C): The atomic mass of carbon is approximately .3. Oxygen (O): The atomic mass of oxygen is approximately . Since there are three oxygen atoms, the total mass contributed by oxygen is: Adding these together gives the molar mass of potassium carbonate: Therefore, the molar mass of is approximately .The correct answer is .