Calculate Mr (CO2), Mr (Na2CO3), Mr (H2SO3). Explain if carbon dioxide (CO2) can be called a simple substance. Why?

1) In order to calculate the relative molecular weight of a molecule, it is necessary to add up the relative atomic masses of the elements that make up the molecule, having previously multiplied by the number of these atoms.

Mr (CO2) = Ar (C) + Ar (O) * 2 = 12 + 16 * 2 = 44 amu

Mr (Na2CO3) = Ar (Na) * 2 + Ar (C) + Ar (O) * 3 = 23 * 2 + 12 + 16 * 3 = 106 amu

Mr (H2SO3) = Ar (H) * 2 + Ar (S) + Ar (O) * 3 = 1 * 2 + 32 + 16 * 3 = 82 amu

2) Carbon dioxide cannot be called a simple substance, because, by definition, a simple substance is a substance consisting of atoms of one chemical element. For example: O2, H2. Carbon dioxide consists of atoms of two chemical elements (carbon and oxygen), which means CO2 is a complex substance.