Question

Why does a mole of a molecule of water (H2O) have a mass of 18 g, while a mole of a molecule of carbon dioxide (CO2) has a mass of 44 g?

A) Because the mass of oxygen is 16 g/mol, and hydrogen is 2 g/mol.
B) Because water molecules are lighter than carbon dioxide molecules.
C) Because the mass of carbon is greater in CO2.
D) Because the mass of a mole varies for different substances.

Answer 1

A mole of a molecule of water (H2O) have a mass of 18 g, while a mole of a molecule of carbon dioxide (CO2) has a mass of 44 g. Because the mass of oxygen is 16 g/mol, and hydrogen is 2 g/mol. So, the correct answer is A.

Step-by-step explanation:

The molar mass of a substance is determined by the mass of its individual atoms or ions. In the case of water (H2O), the molar mass is calculated by adding the atomic masses of two hydrogen atoms (2 g/mol) to the atomic mass of one oxygen atom (16 g/mol), resulting in a molar mass of 18 g/mol. Similarly, for carbon dioxide (CO2), the molar mass is calculated by adding the atomic mass of one carbon atom (12 g/mol) to the atomic mass of two oxygen atoms (32 g/mol), resulting in a molar mass of 44 g/mo