After 100 mL of 1.0 M NaOH are titrated into a 50 mL solution of HCl, the indicator changes color, signaling that the solution has been neutralized. What was the [HCl] concentration?

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.

Where is the following?

Just took the quiz on edgenuity and the correct answer is "c.  4.54 x  10–12  j"