The solubility graph below shows the amounts of four substances that will dissolve in 100 grams of water at various water temperatures.
Which substance has 80 grams of solute dissolved in 100 grams of water
at 50 C?

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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.

The answer is c) pyrite