![]() CO 2 has one carbon atom and two oxygen atoms.Hydrogen, has a molar mass of 1.00794gmol-1, and carbon has a molar mass of 12.00gmol-1. ![]() And how did we get that Well, look at the Periodic Table in front of you (of course there must be one in front of you given that you doing your chemistry homework. Oxygen (O) has an atomic mass of about 16.00 amu. Well the molar mass of methane is 16.04g.we write 16.04gmol-1.Carbon (C) has an atomic mass of about 12.01 amu. ![]() Let's calculate the molar mass of carbon dioxide (CO 2):
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