It seems you're asking about the molar mass (also sometimes called molecular weight) of CO2 (carbon dioxide) and Na2CO3 (sodium carbonate).

Here's how to calculate the molar mass and what those values are:

CO2 (Carbon Dioxide)

* C (Carbon): Atomic mass = 12.01 g/mol

* O (Oxygen): Atomic mass = 16.00 g/mol

Molar mass of CO2 = (12.01 g/mol) + (16.00 g/mol x 2) = 44.01 g/mol

Na2CO3 (Sodium Carbonate)

* Na (Sodium): Atomic mass = 22.99 g/mol

* C (Carbon): Atomic mass = 12.01 g/mol

* O (Oxygen): Atomic mass = 16.00 g/mol

Molar mass of Na2CO3 = (22.99 g/mol x 2) + (12.01 g/mol) + (16.00 g/mol x 3) = 105.99 g/mol

Therefore:

* The molar mass of CO2 is 44.01 g/mol.

* The molar mass of Na2CO3 is 105.99 g/mol.