What has a large mass: a) a carbon atom or a water molecule; b) a water molecule or

What has a large mass: a) a carbon atom or a water molecule; b) a water molecule or a magnesium atom; c) iodine atom or oxygen molecule?

To answer the question, you can use the formula for finding the mass of an atom or molecule: ma (X) = Ar (X) * u, where the constant u = 1.66 * 10-24 g.

However, when calculating the masses for each atom or molecule, we will multiply by u the relative atomic or molecular weight. In this case, for the proposed particles, it will be enough to simply calculate the molecular weights and compare with the atomic ones:

a) Ar (C) = 12 less than Mr (H2O) = 18;

b) Mr (H2O) = 18 less than Ar (Mg) = 24;

c) Ar (I) = 127 is greater than Mr (O2) = 32.