The net charge on the sulfur atom is -0.3 μC.
We must know that an atom is composed of electrons, protons and neutrons. Th electrons are found in the orbits, the protons are found in the nucleus along with the protons. We could add a net charge to the electron by adding or removing an electron from it.
Now we are trying to obtain the net charge, in coulombs, would you place on it if you put an extra electron on 1 in 10^12 of its atoms.
We have;
1 electron/ 1 * 10^12 * -(1.6 * 10^-19)/ 1 electron * 100g * 1 mol/32 g/mol * 6.02 * 10^23 atoms/mol
= -0.3 μC
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Missing parts;
What net charge would you place on a 100 g piece of sulfur if you put an extra electron on 1 in 1012 of its atoms? (Sulfur has an atomic mass of 32.1.)