A sample of water releases 50 Kj of heat when it cools from 50C to 30C. How many miles of water cooled?

Where's the pictures ?

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.

Yes, endothermic means it turns cold. and some chemical changes include change of tempature.