What is the correct way to calculate the mass percentage of carbon in ethane -- C2H6?

Because electrons have negligible mass, to account for the mass of the isotope, there must be 16 neutrons, 16 neutrally charged, massive, fundamental particles present in the sulfur nucleus. and thus finally, if we have the 32s2− ion, there are 18 electrons, 16 protons, and 16 neutrons.

Nonmetal are moldable and easily shaped

We can't until we know what we are working with or on