• The mass of carbon is 12.0107 amu.
,• The mass of Hydrogen is 1.0078 amu.
Before we add the masses above, we have to multiply the mass of one Hydrogen atom by 4 because in the compound CH4 there are 4 hydrogens atoms.
[tex]4\cdot(1.0078amu)=4.0312amu[/tex]Them, we add the masses.
[tex]12.0107\text{amu}+4.0312\text{amu}=16.0419amu[/tex]Therefore, the mass of the compound is 16.04 amu.