What is the AR or MR value of Co2 and NA2CO3?

The AR (Atomic Relative) or MR (Molecular Relative) value refers to the molecular weight (also called molar mass) of a compound, which is the sum of the atomic weights of all the atoms in a molecule.

For CO₂ (Carbon dioxide):

• Carbon (C) has an atomic mass of approximately 12.01 g/mol.
• Oxygen (O) has an atomic mass of approximately 16.00 g/mol.

The MR of CO₂ = (12.01) + (2 × 16.00) = 44.01 g/mol.

For Na₂CO₃ (Sodium carbonate):

• Sodium (Na) has an atomic mass of approximately 22.99 g/mol.
• Carbon (C) has an atomic mass of approximately 12.01 g/mol.
• Oxygen (O) has an atomic mass of approximately 16.00 g/mol.

The MR of Na₂CO₃ = (2 × 22.99) + (12.01) + (3 × 16.00) = 105.99 g/mol.

Thus:

• MR of CO₂ = 44.01 g/mol
• MR of Na₂CO₃ = 105.99 g/mol.